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What Is a Case Study?

What is a case study interview, how to prep for a case study interview, case study interview example questions, during the case study interview.

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A case study interview isn’t your average interview. While most interviews ask you to give examples of how you use your skills on the job, in a case study interview, you’ll use those skills in front of the interviewer to solve a real-life problem.

It’s like auditioning for the school play. But instead of showing you can sing and dance, you’re using a case interview to show how you provide innovative solutions to pressing business problems. Not sure how to get ready for this kind of interview? We’ve got you covered. This guide explains how to prep for a case study interview.

Case studies are used across a variety of industries — everything from business to medicine. They are an in-depth examination, analysis, and critique of a real-world scenario the company experienced. People discuss the situation and explore what they learned while forming new solutions to try when they face a similar situation in the future and hope to improve their performance.

For example, doctors and nurses use case studies to improve how they diagnose and treat patients. Using real patient information, the medical team analyzes the case to see what the team may have missed and why they missed it. Learning from these errors helps the team better prepare for similar cases in the future to improve patient care.

While many industries use case studies to iterate and improve their performance, not every company uses case study interviews. This type of interview is very common at consulting companies (no matter what kind of consulting it is). But it’s not unusual for companies outside of consulting to use case interviews for marketing or operations roles.

In a case study interview, you’re given a real-world situation the company has faced and are tasked with analyzing it and suggesting a course of action.

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Businesses use case study interviews to assess your abilities in real-time. While you’ll probably draw on a variety of skills, most case study interviews assess:

• Strategic thinking
• Analytical skills
• Common sense

The advantage of a case study interview is that the interviewer can evaluate your ability in each of these areas and see how you’ll actually use them on the job.

What Is a Fit Interview?

Some people use “case study interview” and “fit interview” interchangeably. While a fit interview and a case study interview both ask behavioral interview questions , they are not the same thing.

A case study interview assesses your ability to do the job. It primarily evaluates how you approach business problems and use your skills to solve them. A fit interview is about company culture fit. The interviewer asks questions that assess how well you’ll fit into the company, like asking you questions about what motivates you or how you lead .

Fit and case interviews are important parts of the evaluation process. Getting the job done is just as critical as getting along with coworkers and supporting the company’s mission. Depending on where you interview, you may have one fit interview and one case study interview, or the fit interview may be a smaller part of the case study interview.

What You’ll Learn in a Case Study Interview

A case study interview allows the hiring manager to see your skills in action and how you approach business challenges. But it also teaches you a lot about the company (even if you’re doing most of the talking).

In a sense, you’re behaving as an employee during a case study interview. This gives you a peek behind the curtain, allowing you to see the company’s inner workings, like how they approach business problems and what they expect from you and your performance.

For example, you may offer a novel approach to solving a problem during a case interview. How does the interviewer react to it? Are they impressed? Surprised? Is there a scowl or frown on their face? Their reaction gives you insights into how the company will likely receive your solutions.

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Depending on the specific company, you may have the case study interview questions in advance, but you may not. Whether you do or don’t, here’s how to prepare for a case study interview.

Conduct Deep Research

Good interview prep for any interview means researching the company. That includes things like learning more about the company’s mission and the challenges the industry faces. But when you’re preparing for a case study interview, your research needs to go deeper. 

When you answer a case study question, your answer has to be specific to the company’s clients or business objectives. For example, if you’re interviewing for a role in strategy consulting , your answer shouldn’t focus on aspects of human resources consulting (unless it’s particularly relevant).

Your research needs to include the kinds of clients the company works with and what types of problems the company solves. For example, the company may only consult for Fortune 100 companies that need accounting advice. Keep these facts in mind as you prepare for the interview.

Case Study Interview Formats

There are four types of case study interview formats:

• Candidate-led: The interviewer asks you a specific question (or gives you a prompt), and you walk the interviewer through a detailed answer.
• Employer-led: The interviewer leads you through a series of specific (and predetermined) prompts and questions, no matter your answers.
• Presentation: You’re given a problem in advance to create and present a detailed case study.
• Video: Similar to a presentation case study interview, you’ll create a video presentation of the case study.

Most companies will tell you in advance which style of case study interview you should prepare for. But if they don’t, reach out to your recruiter or check the company’s website. Many include the essential details you need to prepare for the case study interview.

Seek Out Company-Specific Tips

Speaking of companies and their websites, not only do many companies that use case study interviews tell you the format, they often include helpful tips and tricks to help candidates prepare. This includes what to expect, what the company is looking for skill-wise, and what kinds of responses they want. They may even have a few practice questions and videos you can use to help you prep.

Unlike other common interview questions , it’s not as easy to prepare an answer to case study interview questions. Even though you know it’s a case study interview, you don’t necessarily know the specifics of the case or what problems you’ll be asked to solve.

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That said, it’s likely your case study interview questions will cover one or several of these concepts:

• Entering new markets
• Increasing profits
• Cutting costs
• Turnarounds
• Mergers and acquisitions
• Pricing strategy
• Developing new products
• Industry analysis
• Competitive response

While there are many ways to answer case study interview questions, a few basic prep tips can help you get ready for every question.

In addition to what you usually bring to a job interview , make sure you bring a notepad and pen or pencil to a case study interview. Taking notes will help you better understand the questions and formulate your answers. It also gives you a place to calculate numbers and figures if you need to. Not every case study interview allows calculators, so you’ll need to be ready to do your calculations manually.

Ask Specific Questions

As you’re working through the case study, you can and should ask any clarifying questions you need. The interviewer wants to hear specific, detailed answers that solve the problem. So, whenever you’re unclear, ask a follow-up question to not only get what you need but to give the interviewer what they need. 

That said, your question(s) should be very specific. You need to verify exactly what the interview is asking so you can create an appropriate answer. Say the interviewer gives you a broad question: The client’s revenue is falling. How do you help them increase it? You can follow up with a very specific question or two to make sure you understand what the interviewer is asking:

You’re asking how I would help the client raise revenue, correct? Are you also asking how I would help them increase their profit and cut costs?

>>Related: 5 Top Questions to Ask in an Interview (and Why You Should Ask Them)

Talk Them Through It

A big part of the case study interview is seeing you in action. However, in this case, “see” really means “how you think.” Since the interviewer can’t hear your inner monologue, you’ll need to practice thinking out loud.

While the interviewer wants to hear your solution, they also want to hear how you got there. That means talking through your entire thought process. Instead of saying, “I’d do X,” you have to explain how you arrived at your decision while you’re getting there.

Because not everyone thinks out loud, it may feel unnatural to you, and you likely won’t be expected to do it on the job. But it’s crucial to practice this skill — and it is a skill — because the interviewer is expecting you to do it in a case study interview.

Want to give a case study a shot? Try out a Forage consulting virtual simulation program and gain the skills you’ll need to ace a case study interview.

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Facebook Interview Process & Questions

Looking to land a job at Facebook but don’t know what the process looks like?

I’ve got you covered. In this article, we will look at what goes on in each step of Facebook’s hiring process, two different types of Facebook’s interview questions, and three tips to ace any Facebook interviews. Here are the four steps of the Facebook interview process:

Step 1: Pass the resume screening

Step 2: Pass the phone screenings (1-2 rounds)

Step 3: Pass the on-site interviews (4-5 rounds)

Step 4: pass the hiring committee reviews and get the offer.

Table of Contents

Four steps of the Facebook recruitment process

The first part of Facebook’s hiring process is, similar to most corporate jobs, resume screening. In this round, recruiters will screen your resume for technical requirements, education, experience,.. to make sure you’re a potential fit.

Although hiring criteria depend on roles and company, the fundamental principles of writing winning resumes at Facebook is almost identical to writing winning consulting resumes. There are three fundamental rules you must apply in your resume:

Rule #1: Explicitly display the skills and traits that Facebook seeks in candidates

What Facebook looks for in its employees are: leadership ability, analytical problem-solving skills, excellent written and oral communication, “gritty” character, intense curiosity, and humility.

Rule #2: Write specific, result-oriented, and explicit bullets

  When talking about your experiences and achievements, the way to go is through objective information. A good bullet should sound something like: 

“Reduce overhead by 20% (or $2MN) for an online news media company by leading a cross-functional team to migrate the client’s finance operations cost centers to a shared-services model.” 

Rule #3: Using professional, structured, and to-the point language

Using professional, structured, and to-the point language implicitly shows screeners that you’re a good communicator. Highlighting your achievements with explicit numbers and good structures also save screening time and leaves a good impression.

Before moving on, I highly recommend you checking out my consulting resume overview and specifically look at the resume examples I corrected to see how these rules can supercharge your resume.

Step 2: Pass the phone screenings (2 rounds)

There are usually two rounds of phone screenings at Facebook : the recruiter phone screening (or the pre-screen) and the technical phone screening.

In the recruiter phone screening round, which lasts 20 minutes, an HR recruiter will contact you to ask a few questions on the phone. These questions are somewhat behavioural, aiming to reveal your background information and qualities, from which the recruiter will assess your fit for the selected role.

If you pass this initial phone screening, the recruiter will match you with a Facebook engineer to conduct the technical phone screening, which lasts around 45 minutes. You’ll be asked some questions pertaining to your resume for 10-15 minutes, then spend the next 30 minutes completing one or two coding questions (e.g. data structures, algorithms, etc) on a simple online code editor (e.g. CoderPad).

Once you’ve passed the phone screenings, you’ll move on to the tough on-site interviews. In a typical on-site interview, you will be interviewed with another 4-5 people for 45 mins each.

On-site interviews usually consist of 4-5 rounds, in which two things will be assessed: (1) Your fit for the selected role (role-specific fit) and (2) Process, teamwork, and culture fit (firm-specific fit).

For technical roles, there are generally two types of interviews you should be aware of: Coding on-site interviews and System Design on-site interviews. For each type, expect 2 or more interviews.

Coding on-site interviews involve whiteboarding solutions to slightly harder data structures and/or algorithmic problems. The lesser experienced you are, the more number of coding onsite interview rounds for you.

System Design Onsite interviews involve coming up with high level design architectures for real life products. The more experienced you are, the more number of these interviews you might face.

For both technical and non-technical roles, you’ll definitely get teamwork/process/culture fit interviews. The fit interview will be a combination of topics ranging from agile methodology or workflow, teamwork and collaboration, and conflict resolution.

Congratulations! You’ve passed the on-site interviews, the toughest part of the interview process. At this point, candidates will be assessed in candidate review meetings, where team leaders/ managers will determine whether you’re a good fit for their respective teams. If a team wants you, they’ll tell your recruiter and it will be added to your portfolio, which will then be submitted to the hiring committee

After that, your performance will be evaluated by a hiring committee consisting of Facebook seniors. This step is usually a formality. Before the hiring committee session, each reviewer often takes hiring recommendations made in the candidate review meetings, which will be discussed during the session. If all members agree on one recommendation, an offer will be extended.

Three tips to ace Facebook interviews

The beginning of every interview at Facebook will involve 15-20 minutes of behavioural questions. Hence, it’s crucial that you present yourself in a consistent, thorough manner. Most importantly, however, you must demonstrate the traits that Facebook looks for in every answer. Below, I’ve summarised three tips to help you ace every fit interview question, keep reading!.

Tip 1: Prepare stories, not questions

For any interview, especially fit interviews, it is best to prepare 3-4 detailed, all-round, refined stories exhibiting all the required attributes (for Facebook, they’re the below “Facebook” traits). This way, you can tune the stories according to the interviewer’s questions in a flexible, consistent manner.

Many candidates make the mistake of preparing on a per-question basis, i.e listing out the possible questions and the corresponding answers/stories. Wrapping your head around inflexible answers can throw you off-balance when an unexpected question comes up. The resulting storytelling style is also somewhat robotic.

Instead, in the Case Interview End-to-End Secrets Program, I teach a story-based approach: select a few stories reflecting your best, all-round self, and develop them in detail. 

Learn more: The online guidebook to case interview

Tip 2: Explicitly show Facebook traits

To prepare your stories, compare your past experiences with Facebook traits, along with personal values you’re most proud of, and select the stories best reflecting those traits and values. You want to show that your values and experiences perfectly match what recruiters look for.

So what are these famous “Facebook” traits? Above all, Facebook places emphasis on kindness, empathy, and humility in their people. Successful candidates also excel in these criteria: learning ability, teamwork, communication skills, leadership.

Learning ability: Facebook not only values excellent cognitive abilities, but also problem-solving ability, curiosity, and ability to learn.

Teamwork: Working at Facebook demands that you’re a great team player. Merely being an independent, hard-working employee isn’t going to cut it – you’ve got to work, think, and succeed in teams.

Communication skills: succeeding in teams also requires excellent communication skills, and this holds true not only for Facebook but many companies.

Leadership: Facebook defines leadership as the willingness to step into a difficult problem and step out when their expertise is not needed. One person is not always going to be the right leader for everything Facebook does – work will be handled in small-sized teams (4-6 people) consisting of people with different skill sets.

Tip 3: Use the Problem-Action-Result framework

As the name suggests, the Problem-Action-Result method, also known as the STAR method, is a technique you can use to clearly demonstrate specific skills/ traits required for a job position. Using this framework instantly makes your answers more structured, logical, easy for listeners to follow, and easy for you to keep track of.

STAR stands for:

Situation: An event, project, or challenge faced

Task: Your responsibilities and assignments for the situation

Action: Steps or procedure taken to relieve or rectify situation

Result: Results of actions taken

Example: Tell me about a time when you used your initiative to resolve a complex problem. What was involved and what actions did you take?

STAR Model Answer:

Last year while working as Customer Service Manager with XYZ Products Ltd in Germany, I successfully implemented a new process which reduced the time taken to process customer refunds from 14 days to 2 days, saving over £100,000 annually in agent time and gaining a 50% uplift in customer approval ratings.

Our customer refund process was taking 14 days and was using up an excessive amount of agent time and resources. I was tasked with reducing this to 2 days with the added benefit of saving time and resources.

First, I initiated the project by clearly defining the objectives and procedures. Then, I created a detailed brief analyzing the problem and outlining the potential benefits of the newly proposed process.

After that, I completed a walk-through of the existing system to identify where the problems lie. I interviewed the agents involved to gather their input into both the current system and their ideas of what they thought would work well.

With all that knowledge, I designed a new process and drafted a brief which I then forwarded to four software companies who specialise in the system we needed.

After presentation and consultation with my management team I organised a project team tasked with implementing this new system.

I set up a system for internal and external feedback and communication, ensuring that everyone involved was on board and up to speed. I was very pleased with the outcome. I reduced the time taken to process customer refunds from 14 days to 2 days, saving over £100,000 annually in agent time. 

Facebook interviews’ question types and examples

Facebook Interview Questions comprises three main types: fit questions, technical questions, and brain-teaser questions. Fit questions may appear in technical interviews, but are mostly asked during fit interviews. Technical questions are strictly limited to technical interviews, and brain-teaser questions may appear in all types of interviews.

No.1: Fit questions

1. What is it

For example, if you’re applying as a product manager, you might be asked the following fit interview questions:

• What’s a product you love/hate? Why? How would you improve it?
• How would you solve homelessness in San Francisco?
• Why does Starbucks sometimes have coffee shops on both sides of the road?
• Facebook has invented a technology that makes air travel 4x cheaper and 4x faster. What do you do with it?
• If you could implement a new feature for Gmail, what would it be?
• What will be the impact of self-driving cars?
• What technology trends are you following at the moment?
• You’re part of the Facebook Search web spam team. How would you detect duplicate websites?
• If you were to build the next killer feature for Facebook, what would it be?
• How would you determine if a new Facebook Search feature launch was successful?

2. How to approach it:

Remember, the main purpose of behavioural questions is to test your fit for the position you’re applying to. Hence, the key is to  prepare 3-4 stories gearing towards the specific job requirements (professional experience, attributes, character, etc).

For example, if you’re applying as a software engineer, prepare 3-4 stories about your technical experiences, and don’t forget to include traits that make great software engineers (supreme communication skills, quick learning ability, good team player, etc), in addition to the aforementioned Facebook traits.

To prepare an all-rounded story, read this article for the full guide. Alternatively, follow these three steps:

Lay down the content base:

  Compare your past experiences with Facebook traits along with personal values you’re most proud of, and select the stories best reflecting those traits and values. 

List down as many details of your stories as possible, make sure they follow this structure: Problem, Actions, Result, Lesson.

Form the story plot:

Trim the unnecessary details, simplify the technical parts to help the listeners understand, then rearrange and dramatize the rest to make your accomplishments really stand out. 

Add the Facebook spirit into the mix by emphasizing the relevant traits, telling your stories in a structured way, explaining all your actions, etc.

Refine your style:

  Your style of story-telling should be entertaining for both you and your audience. Take time to practice and find your style – and remember, it should be natural, otherwise you won’t be able to use it in a high-stress, high-stake interview. 

Keep in mind that your style should be formal, because it’s a job interview we’re talking about. Don’t do your trademark sarcasms there, it’s not a stand-up comedy session.

No.2: Technical questions

1. What it is:

Technical questions are exclusively reserved for candidates applying for technical roles, such as Software Engineer, Electrical Engineer, Test Engineer, Network Engineer, to name a few. Coding interview questions often fall into the following categories: 

• Arrays / Strings (38% of questions, most frequent)
• Graphs / Trees (29%)
• Dynamic Programming (18%)
• Search / Sort (9%)
• Linked lists (4%)
• Stacks / Queues (2%, least frequent)

2. Sample questions and solutions:

Below is a comprehensive list of Facebook Coding Interview questions, for all aforementioned categories. Solutions are at the end of every problem.

• Given an integer array, move all elements that are equal to 0 to the left while maintaining the order of other elements in the array. See solution. 
• Given a list of intervals, merge all the overlapping intervals to produce a list that has only mutually exclusive intervals. See solution.
• Implement next permutation, which rearranges numbers into the lexicographically next greater permutation of numbers. See solution.
• Given a string S and a string T, find the minimum window in S which will contain all the characters in T in complexity O(n).” See solution.
• Given an array nums of n integers where n > 1, return an array output such that output[i] is equal to the product of all the elements of nums except nums[i]. See solution.
• Given the head pointers of two linked lists where each linked list represents an integer number (each node is a digit), add them and return the resulting linked list. See solution.
• Given two sorted linked lists, merge them so that the resulting linked list is also sorted. See solution.
• Convert a binary tree to a doubly linked list so that the order of the doubly linked list is the same as an in-order traversal of the binary tree. After conversion, the left pointer of the node should be pointing to the previous node in the doubly linked list, and the right pointer should be pointing to the next node in the doubly linked list. See solution.
• Given a binary tree and a number ‘S’, find all paths from root-to-leaf such that the sum of all the node values of each path equals ‘S’. See solution.
• Reverse the order of words in a given sentence (an array of characters). See solution.
• Given a dictionary of words and an input string tell whether the input string can be completely segmented into dictionary words. See solution.
• Given a list of daily stock prices (integers for simplicity), return the buy and sell prices for making the maximum profit. We need to maximize the single buy/sell profit. If we can’t make any profit, we’ll try to minimize the loss. See solution.
• Given a double, ‘x’, and an integer, ‘n’, write a function to calculate ‘x’ raised to the power ‘n’. See solution.
• You are given a set of integers and you have to find all the possible subsets of this set of integers. See solution.
• There is a dictionary containing words from an alien language for which we don’t know the ordering of the characters. Write a method to find the correct order of characters in the alien language. See solution.
• Serialize a binary tree to a file and then deserialize it back to a tree so that the original and the deserialized trees are identical. See solution.
• Given a sorted array of integers, return the low and high index of the given key. Return -1 if not found. The array length can be in the millions with many duplicates. See solution.
• Search for a given number in a sorted array that has been rotated by some arbitrary number. See solution.
• Given a sorted dictionary (array of words) of an alien language, find the order of characters in the language. See solution.
• Check whether a given graph is Bipartite or not. See solution.
• We have a list of points on the plane. Find the K closest points to the origin (0, 0). See solution.
• Given two arrays, write a function to compute their intersection. See solution.
• Given an array of meeting time intervals consisting of start and end times [[s1,e1],[s2,e2],…] find the minimum number of conference rooms required. See solution.
• A linked list is given such that each node contains an additional random pointer which could point to any node in the list or null. Return a deep copy of the list. See solution.
• Given a singly linked list L: L0?L1?…?Ln-1?Ln, reorder it to: L0?Ln?L1?Ln-1?L2?Ln-2?… See solution. 

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The scoring mechanism in the McKinsey Digital Assessment

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Case Interview: The Free Preparation Guide (2024)

The case interview is a challenging interview format that simulates the job of a management consultant , testing candidates across a wide range of problem-solving dimensions.

McKinsey, BCG and Bain – along with other top consulting firms – use the case interview because it’s a statistically proven predictor of how well a candidate will perform in the role. The format is not only used by management consulting firms. Other types of organizations – like tech companies, financial services institutions, and non-profits – often use case interviews to assess candidates who are interviewing for roles focused on shaping strategic initiatives.

If you’re preparing to face a case interview, you may be feeling a little apprehensive. The format is notoriously demanding and unlike any other type of recruitment assessment you may have experienced before. However, with the right preparation and investment of time and effort, it is possible to master.

In this guide, we break down everything you need to know about the case interview, outlining exactly what you need to do to prepare effectively and ace the case.

Key takeaways

• The classic case interview format follows the same steps that a management consultant would encounter on a client project. The interview is a little like a role-play where the interviewer plays the role of a client and the candidate plays the part of the consultant hired to solve the problem.
• Some firms occasionally deviate from the classic case interview format. Popular alternatives include written case studies – which require candidates to review paper documents and then prepare and deliver a presentation – and market sizing case interviews, which require candidates to estimate a number.
• Case interviews test candidates against a set of six problem-solving dimensions: structuring, math, judgment and insights, creativity, synthesis, and case leadership. The interviewer uses a scorecard to assess the candidate’s performance in each of these areas.
• Case interview questions can be about almost any type of challenge or opportunity. However, our research indicates that there are 10 types of questions that are asked most frequently at top consulting firms. These include questions on profit improvement, revenue growth, and market entry.
• To do well in a case interview, it’s vital to create custom interview structures that meet the conditions of the ‘AIM’ test. It helps to have a good working knowledge of key case interview frameworks, but this alone is not sufficient.
• A strong grasp of case math is also crucial when it comes to case interview performance. While only high-school level math skills are required, it’s an aspect of the case interview that many candidates find challenging.
• Successful candidates are able to summarize their findings effectively. They also demonstrate strong case leadership by progressing through the case proactively and remaining focused on its overarching objectives.
• To prepare for a case interview, it’s essential to learn every problem-solving skill that will be assessed. We teach all of these skills in our Interview Prep Course , which contains all the video lectures, sample interviews, case material, and practice tools you’ll need to ace any case interview.
• Most candidates who go on to receive an offer from a top consulting firm like McKinsey, BCG or Bain complete at least 25 live practice sessions with a partner before their interview. You’ll find over 100 high-quality cases in our Case Library and a diverse community of candidates available for practice in our Practice Room .
• Some candidates choose to supplement their preparation by working with a coach who has been an interviewer at a top consulting firm. Here at CaseCoach, our coaches have all been handpicked from the alumni of top firms such as McKinsey, BCG and Bain.
• Although the world’s top consulting firms all test candidates using similar methods, none of them approach the interview process in exactly the same way. If you’re preparing to interview at a top consulting firm, it’s important to do your research and find out what you can expect.

An introduction to the case interview

The case interview format, the classic case interview.

The vast majority of case interviews follow the same steps that management consultants encounter on real client projects.

• Brief: The interviewer gives the candidate a brief for the case. They explain the context in which the client is operating, and outline the challenge they’re facing.
• Clarification: The candidate then has the chance to ask clarifying questions. They might do this to ensure they’ve understood the context of the problem correctly or to confirm the client’s goals.
• Reflection: The candidate takes 60 to 90 seconds or so to reflect and lay out a structured approach to solving the case.
• Analysis: The candidate and interviewer then work through the case together, carrying out analyses and moving toward a recommendation. This is the part of the case where you’ll be handling numerical questions, reviewing exhibits, coming up with creative ideas, and so on. It comprises the vast majority of the time you’ll spend on the case.
• Synthesis: The case concludes with the candidate synthesizing their findings and making an overall recommendation to the client.

So what does this unique interview format look and feel like? In reality, a consulting case interview is a little like a role-play. The interviewer plays the role of a manager or client, and the candidate plays the part of the consultant hired to solve the problem. However, a case interview shouldn’t feel like a performance. The most successful candidates treat it as a natural conversation between two professional people.

In the video below you can see an example of exceptional case interview performance in action. The candidate and interviewer in the video are both former McKinsey interviewers.

Interviewer-led vs candidate-led cases

Although the classic case interview has an established format and assesses a specific set of skills, cases can be delivered in different ways. Some are more candidate-led, while others are more interviewer-led

In a candidate-led case, the candidate is in the driver’s seat and is free to explore different aspects of the problem. Interviewers don’t tell candidates what to focus on next. Instead, they provide additional information – like an exhibit or a new fact – when asked. The candidate then analyzes the information and suggests next steps to get to the answer.

In an interviewer-led case, the interviewer may interrupt the candidate and ask them to either perform a specific investigation or focus on a different aspect of the problem. This doesn’t mean the interview is going badly; the interviewer is simply following a script. As a result, in an interviewer-led case, candidates are less likely to take the wrong path.

It’s difficult to predict which style of case you’ll receive. Some firms are known for using one style of interview more frequently than another. However, in practice, most interviews fall somewhere between the two extremes, depending on the style of the interviewer and the case material they’re using. You should therefore always be ready to suggest next steps and have a view about how to get to the answer.

Other case interview formats

While the classic case interview is most common, there are a couple of other interview formats that top consulting firms use from time to time:

The written case study

Some management consulting firms use written case studies to simulate the experience of carrying out consulting work even more accurately than the classic, verbal case interview. In some locations, BCG and Bain have been known to adopt this approach for a small minority of candidates.

In written cases, candidates review a series of paper documents and then structure the problem, run some numbers, generate ideas and, finally, deliver a short presentation. You can learn more in our article on how to crack written case studies .

Market sizing case interviews

Management consulting firms and other employers sometimes use market sizing questions – also known as estimation questions – as a standalone interview format to assess candidates on a wide range of problem-solving dimensions.

In a market sizing interview, you’ll be asked to estimate a number. This might be something like the revenue of a sandwich store or how many ATMs there are in a certain city. The ability to size a market is also a skill required for solving many case interview questions. You can learn more in our article on how to nail market sizing case interviews .

Some key differences to expect

While case interviews are highly codified, it’s important to remember that every interview is unique.

In the final round of interviews, for example, cases may feel less scripted than they did in the first stage. Partners – who are part of the interviewing group in the final round – often use the same case for years at a time. This means they can deliver it without a script and, as a result, tend to give candidates more room to take the lead. You can learn more in our article on the differences between a first and final-round interview at McKinsey, BCG and Bain .

In addition, each firm or office might bring their own nuance or style to the classic case interview format. It’s important to do your research and find out what you can expect from the interview experience at your target firm or office. You can learn more in our article on how the interviews at McKinsey, BCG and Bain differ .

The skills assessed in case interviews

Case interviews are primarily about testing a set of problem-solving skills. The interviewer uses a scorecard to assess a candidate’s performance in the following dimensions:

• Structuring: This is the ability to break problems down into logical drivers. It’s most obviously required at the beginning of a case, where you can pause and take a moment to come up with an approach. But it’s also tested each time you have to consider a new aspect of the problem.
• Math: Most cases contain a quantitative component, such as estimation questions, break-even questions, or other calculations. To do well in this dimension, you need to lay out a clear and efficient approach, run calculations quickly and accurately, and then state their implications for the case.
• Judgment and insights: This dimension is about extracting insights from data, usually by interpreting information in a chart. Performing well in this area involves processing new information quickly, prioritizing what’s important, and connecting your findings to develop sound recommendations.
• Creativity: Cases often have a creative thinking component. Sharing numerous, varied and sound ideas – ideally in a structured way – can help you succeed here.
• Synthesis: This is all about wrapping up the case with a clear and practical recommendation, and delivering it convincingly.
• Case leadership: This dimension is about progressing through the case efficiently and staying focused on its objectives. Case leadership involves gathering facts effectively and building on new findings to develop a recommendation. It’s a particularly important dimension in candidate-led cases.

Questions to expect

If you’re preparing to interview at a top management consulting firm like McKinsey, BCG or Bain, you’re probably curious about the kind of case interview questions you can expect to receive.

To identify the most common case interview questions , we surveyed CaseCoach users who interviewed at either McKinsey, BCG or Bain for a generalist role in 2023. We found that of the 260+ case interviews reported by respondents:

• 20% focused on profit improvement
• 15% focused on revenue growth
• 12% focused on market entry
• 10% focused on cost cutting
• 9% focused on process optimization

These topics align with the typical challenges and opportunities faced by CEOs. Because the job of a management consultant is to help CEOs find solutions to these problems, it’s vital for candidates to demonstrate that they understand the issues behind these questions.

However, while there are some recurring topics, the context and nuances of each individual case mean that no two case questions are the same. Increasingly, firms are testing candidates on questions that fall outside of these recurring topics. One way they’re doing this is by focusing on non-traditional areas, like the public sector. If you’re interviewing for a generalist management consulting role, it’s therefore important to be ready for almost any type of case question.

If you’re interviewing for a role that’s focused on a specific industry or function, like financial services , you’ll likely be given a case focused on that particular area.

How to ace the case

Case interviews require you to think on your feet to solve a complex problem that you’ve never seen before, while being assessed against a number of problem-solving dimensions. Here’s what you need to do to rise to the challenge and ace the case:

1. Create case interview structures that meet the AIM test

Of all the case interview assessment dimensions, structuring is perhaps the most challenging, particularly for those who are just starting out. It requires candidates to propose a prioritized and insightful approach to the case that’s composed of a comprehensive set of independent drivers. Structuring plays a foundational role in the interview, setting the course for the entire conversation.

So, what does good case structuring look like? An effective structure should meet the conditions of the ‘AIM’ test. ‘AIM’ stands for:

• Answer-focused: The structure should identify the client’s goal and the question to solve. It should also provide an approach to answering that question.
• Insightful: The structure should be tailored to the specifics of the client or to the problem in question. You shouldn’t be able to apply it to another case of the same type.
• MECE: This is a well-known acronym among consultants. It stands for ‘mutually exclusive and collectively exhaustive’. In plain English, if a structure is ‘MECE’ it has been broken down into an exhaustive set of independent drivers.

2. Know key case interview frameworks

In a case interview, you’ll be asked to structure a variety of problems. There are a number of frameworks that can help you do this, whether the problem you’re structuring corresponds to a common case question or a different topic entirely:

Business frameworks

You can use established business frameworks to craft custom structures for the most common types of case questions. These include frameworks for mastering profitability questions , answering revenue growth questions and nailing market sizing questions .

Academic frameworks

For unusual case questions that don’t relate to an obvious business framework, it can be helpful to draw on an academic framework like supply and demand, ‘the three Cs’, or Porter’s Five Forces. You can learn more about all of these in our ultimate guide to case interview frameworks . The article includes other business and academic frameworks that you can use to craft custom structures for case questions.

Logical frameworks

Finally, logical frameworks can help you look at the big picture in order to structure your approach. These options can be particularly useful when you’re faced with an unusual case question that doesn’t lend itself to a business or academic framework. Some examples of logical frameworks include:

• Structuring with equations: This approach is most helpful for quantitative case questions. Listen out for introductions that focus on a number. These cases can often be broken down into an equation and then structured along its variables.
• Structuring based on hypotheses: This approach is most helpful for structuring qualitative cases. It involves laying out what you most need to believe in order to validate a specific recommendation. These beliefs form your set of key hypotheses, which you then test as you progress through the case.
• Structuring with root causes: This approach works well for structuring cases that require identifying the reasons for a problem. It involves laying out its potential causes in a way that is mutually exclusive and collectively exhaustive (i.e. MECE).

How to apply these frameworks

While business, academic, and logical frameworks can be helpful when it comes to structuring a problem, learning how to use them correctly is a skill in itself. Simply applying a framework to a case interview question in a ‘cookie-cutter’ fashion is not enough. To impress your interviewer and pass the AIM test, your structure will need to be heavily tailored to the situation at hand. In fact, many case questions can be best answered by combining different frameworks.

Ultimately, interviewers want to understand how your mind works and see you think on your feet. You’ll therefore need to demonstrate that you can propose a custom case interview structure to any question.

3. Be comfortable with simple math

Management consulting firms expect you to navigate mathematical problems confidently and reliably in case interviews. Regardless of your academic background or past experience, you’ll need to be able to set an approach to solve the problem, perform calculations quickly and accurately, and state the implications of your solution.

The good news is that you’ll only be required to demonstrate a high-school level of math skills in case interviews. However, with no calculators allowed and an interviewer looking over your shoulder, it’s natural to find this aspect of the experience a little intimidating.

So, what can you expect from case math? The problems you’ll be asked to solve may take the form of straight calculations, exhibits that require calculations, word problems, and estimation questions.

To do well in this part of the case interview, you’ll need to have a strong understanding of:

• The four operations: addition, subtraction, multiplication, and division
• Key math concepts such as fractions, percentages, and weighted averages
• Business math concepts such as income statements, investments, and valuations

To stand out to your interviewer, you’ll also need to work through math problems confidently and efficiently. Here are our top tips for doing this:

• Keep track of zeros: Case questions often involve large numbers, sometimes in the millions or even billions. Keeping close track of your zeros is therefore crucial. We recommend either counting the zeros in your calculation, using scientific notation, or assigning letter units to zeros.
• Simplify your calculations: This will help you work through problems quickly and efficiently while reducing the potential for mistakes. One way of simplifying calculations is by rounding numbers up or down to make them more ‘friendly’.
• Memorize frequently-used fractions: Some fraction values are used so frequently in case math that knowing them – along with their percentage value and decimal conversions – can save you significant time. We recommend memorizing the fraction and corresponding percentage and decimal values of 1/2, 1/3, all the way through to 1/10.

You can learn more in our guide to mastering case interview math .

4. Summarize your findings

Synthesis is a key skill assessed by interviewers, predominantly at the end of a case interview. You need to provide a clear and sound recommendation that answers the overall question convincingly. You must also describe the key supporting points that informed your recommendation and then outline any further steps you would advise the client to take.

When it comes to concluding cases effectively, this four-step framework can be extremely helpful:

• Quickly play the case question back to your interviewer.
• Answer the question directly and briefly by distilling your response into a single sentence, if possible.
• List the points that support your conclusion.
• Outline the next steps that you recommend to the client.

You can learn more in our article on how to conclude a case study interview .

5. Bring it all together with strong case leadership

Case leadership, more than any other dimension, will give your interviewer an indication of how independently you could handle your workstream as a consultant. It’s a particularly important skill in candidate-led cases, where you’ll set the course of the discussion without the interviewer steering you in a particular direction.

Demonstrating strong case leadership means progressing the case efficiently and staying focused on its overarching objectives. Using a ‘tracker page’ to capture your structure and organize your notes throughout the case will help you in this regard.

Another aspect of case leadership is gathering facts effectively. This includes making reasonable assumptions, requesting missing information, and asking probing questions.

Finally, you’ll be expected to build on new findings to develop your recommendation, adapt your approach, and suggest next steps.

Effective case leadership is all about showing your interviewer that you have a strong command of the problem-solving process. After investigating each key driver in your structure, you need to be able to articulate where you are in your overall approach to solving the problem, and what the next steps should be.

To do this, we recommend using a five-step process to handle every kind of analysis you conduct during the case, whether you’re responding to a numerical question, the data in an exhibit, or something else.

Here’s what that five-step process looks like:

• Set your approach. Define what you’re going to do upfront. It’s particularly important to be explicit here, especially if the analysis is in any way complex or ambiguous.
• Conduct your analysis. Your approach here will vary according to the kind of question you’re working through.
• State your findings. You may also want to make a note of your findings on your tracker page.
• State the implications of your findings. Explain how they impact both your answer to the question and the client’s broader goal.
• Suggest next steps. Your findings will sometimes change how you want to approach the rest of the case. This may mean altering your initial structure and editing it on your tracker page.

6. Be your best on the day

When the day of your interview comes around, you’ll want to be at your very best. But what exactly does this mean?

First, you should present yourself in a professional manner. It goes without saying that you should arrive on time but, ideally, you should plan to arrive early. You should also come equipped with the right material: a pen, squared A4 or letter-size paper pad, and copies of your resume. It’s also vital to dress appropriately for the occasion. Usually, this means wearing formal business dress, but this means different attires in different locations. We recommend doing some research to find out what consultants wear at your target firm and office.

To be at your best on the day of your interview, you must be well rested. Sadly, tiredness is one of the most common reasons for underperformance in consulting interviews. The day before is not the time to cram in further preparation. Instead, aim to have a quiet day and to get plenty of sleep at night.

Ultimately, consulting firms want to hire people who can represent the firm and interact with clients at every level, from the shop floor to the C-suite. Successful candidates treat the case interview as an opportunity to play the role of a management consultant advising a client (i.e. the interviewer). This means exhibiting a great deal of confidence and credibility, together with effective communication and an engaging attitude. It’s vital to stay focused on the overall problem and to drive the resolution of the case while being receptive to the interviewer’s input.

There are a lot of balls to juggle in a case interview, with the added pressure of a potentially life-changing outcome, but successful candidates don’t let their nerves get the better of them. We’ve provided some helpful hints and tips in our article on handling the stress of consulting interviews .

Being your best on the day of your interview requires extensive preparation. It means mastering each dimension of the case interview scorecard to the extent that the skills become second nature to you. It also means completing sufficient case practice to be able to focus on the big picture of the case you’re solving, rather than on simply demonstrating a set of skills.

How to prepare for case interview success

Delivering a standard of performance worthy of an offer from a top firm requires extensive case interview prep. In our experience, most successful candidates invest around 60 hours – or 10 hours each week over a six-week period – in their preparation. Failing to put this effort in is among the most common reasons why many candidates are unsuccessful.

Here’s what effective case interview preparation involves:

Learning the skills

In a case interview, your performance is assessed against a set of common problem-solving dimensions. To recap, these are structuring, math, judgment and insights, creativity, synthesis, and case leadership. It’s important to:

• gain a precise understanding of the expectations on each of these skills
• learn the techniques that will allow you to meet these expectations
• practice until your performance meets the required standard

We teach all these skills in our Interview Prep Course . In our bite-sized video lectures, we map out each of the key skills assessed in a case, and explain what you need to know to demonstrate each skill. We also share our tips on how to improve in each dimension, going above and beyond the advice we’ve included in this article.

In addition, our Interview Prep Course includes many more sample interviews that show real candidates – who went on to join top consulting firms – solving cases. Former consulting interviewers explain what the candidates did well on each dimension and where they could have improved.

Math is a critical prerequisite to handling cases and is something you should be comfortable with before you begin practicing. Our Case Math Course – provided as part of the Interview Prep Course – will help you brush up your skills. It contains 21 video lectures that cover everything you need to know, including the four operations, key math concepts, our pro tips, and business math.

After watching all our Interview Prep and Case Math video lectures, we recommend heading to the ‘Drills’ area of CaseCoach, where you can start practicing specific skills. Drills are interactive exercises that pose rapid-fire questions and provide instant feedback. They help you build your skills and confidence in specific case dimensions quickly, allowing you to make the most of your live case practice with partners. Our Interview Prep Course includes a comprehensive set of drills in four key areas: structuring, calculation, case math and chart interpretation.

When it comes to succeeding in a case interview, nothing beats live practice with a partner. Most candidates who go on to receive an offer from a top consulting firm like McKinsey, BCG or Bain complete at least 25 live practice sessions before their interview.

To practice live cases with a partner, you’ll need access to both case material and practice partners. In our Case Library , you’ll find over 100 cases – complete with solutions – developed by former management consultants. You can download eight of these cases right away by creating a free CaseCoach account. You’ll find a diverse community of fellow candidates who are all available for case interview practice in our Practice Room , where we facilitate over 3,000 practice sessions a week.

You can learn more in our article on how to practice case interviews .

Working with a coach

Some candidates choose to supplement their preparations by working with a consulting interview coach who has been an interviewer at a top firm.

These coaches have the skills and experience to gauge your level of performance and help you identify your areas of strength and weakness. They can also provide you with accurate and helpful feedback on your case-solving skills. This insight can help you accelerate your preparation and improve your performance. Getting used to interviewing with a professional should also help to reduce the stress of the consulting interview experience.

Here at CaseCoach, our coaches are all former consultants and interviewers who have been handpicked from the alumni of top firms such as McKinsey, BCG and Bain.

Do your research

Although employers who use case interviews all test candidates using similar methods, none of them approach the interview process in exactly the same way.

For instance, if you expect to interview with McKinsey, Bain or BCG, it’s helpful to know that these firms all give cases of similar complexity. However, there are some key differences. For example:

• Bain has been known to use estimation questions, such as market sizing, in interviews for its most junior (i.e. Associate Consultant level) roles.
• BCG and Bain occasionally use written cases.
• When it comes to the ‘fit’ interview, McKinsey uses its Personal Experience Interview format, while most Bain offices now use a ‘behavioral interview’ . Only BCG consistently uses the classic fit interview format .

Other differences include the number of rounds of interviews each firm conducts, and their preference for using interviewer-led or candidate-led cases. Wherever you interview, it’s vital to do your research and find out what you might be able to expect.

When it comes to getting ready for the case interview, knowing what you will be assessed on, learning how to succeed, and having access to the best practice resources can all go a long way. Now, you need to put in the hard work and prepare! Good luck.

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Career in Consulting

280 Free Case Interview Examples

Do you want to get access to over 280 free case interview examples (with answers)?

If you have interviews planned at McKinsey ,  The Boston Consulting Group , or any other consulting firm, you are probably looking for case interview examples.

So, to help you prepare, I have compiled a list of 280 free case interview examples:

• Over 30 free case interview examples (+ interview prep tips) from the websites of top consulting firms
• More than 250 free case interview examples from top business school case books

Moreover, you’ll get  my take on which case studies you will likely have in interviews.

In short, the resources listed hereafter will be very helpful if you are starting out or have already made good progress in preparing for your case interviews.

One last word : check out this free case-cracking course to learn how to crack the most recent types of case questions consulting firms use in actual interviews.

Let’s get started!

Table of Contents

Get the latest data about salaries in consulting, mckinsey: tips and case interview examples.

McKinsey & Company’s website is definitely one of my favorites.

Because this gives so much insightful information about the role of a consultant and what the hiring process looks like.

Therefore, I highly recommend spending time on their website, even if you are not targeting McKinsey.

In the meantime, here are 8 McKinsey case interview examples

• Electro-light
• GlobaPharma
• National Education
• Talbot trucks
• Shops corporation
• Conservation forever

Check out the McKinsey Hub : A library of 20+ free resources that cover everything you need to secure a job offer at McKinsey.

Besides, here is another McKinsey case interview example.

This case interview question has been recently asked in a real interview:

𝘦𝘊𝘢𝘳𝘊𝘰, 𝘢 𝘑𝘢𝘱𝘢𝘯𝘦𝘴𝘦 𝘭𝘦𝘢𝘥𝘪𝘯𝘨 𝘮𝘢𝘯𝘶𝘧𝘢𝘤𝘵𝘶𝘳𝘦𝘳 𝘰𝘧 𝘦𝘭𝘦𝘤𝘵𝘳𝘪𝘤 𝘱𝘢𝘴𝘴𝘦𝘯𝘨𝘦𝘳 𝘷𝘦𝘩𝘪𝘤𝘭𝘦𝘴, 𝘩𝘢𝘴 𝘣𝘦𝘦𝘯 𝘴𝘵𝘳𝘶𝘨𝘨𝘭𝘪𝘯𝘨 𝘸𝘪𝘵𝘩 𝘢 𝘭𝘰𝘸 𝘮𝘢𝘳𝘬𝘦𝘵 𝘴𝘩𝘢𝘳𝘦 𝘪𝘯 𝘵𝘩𝘦 𝘉2𝘉 𝘴𝘦𝘨𝘮𝘦𝘯𝘵. 𝘛𝘩𝘦𝘺 𝘦𝘯𝘫𝘰𝘺 𝘴𝘵𝘳𝘰𝘯𝘨 𝘱𝘰𝘴𝘪𝘵𝘪𝘰𝘯𝘴 𝘪𝘯 𝘵𝘩𝘦 𝘉2𝘊 𝘴𝘱𝘢𝘤𝘦, 𝘣𝘰𝘵𝘩 𝘥𝘰𝘮𝘦𝘴𝘵𝘪𝘤𝘢𝘭𝘭𝘺 𝘢𝘯𝘥 𝘪𝘯 𝘵𝘩𝘦 𝘪𝘯𝘵𝘦𝘳𝘯𝘢𝘵𝘪𝘰𝘯𝘢𝘭 𝘮𝘢𝘳𝘬𝘦𝘵. 𝘏𝘰𝘸𝘦𝘷𝘦𝘳, 𝘦𝘊𝘢𝘳𝘊𝘰’𝘴 𝘴𝘢𝘭𝘦𝘴 𝘵𝘰 𝘴𝘮𝘢𝘭𝘭 𝘢𝘯𝘥 𝘮𝘦𝘥𝘪𝘶𝘮 𝘴𝘪𝘻𝘦 𝘣𝘶𝘴𝘪𝘯𝘦𝘴𝘴𝘦𝘴 𝘤𝘰𝘯𝘵𝘪𝘯𝘶𝘦 𝘴𝘵𝘢𝘺𝘪𝘯𝘨 𝘧𝘢𝘳 𝘣𝘦𝘭𝘰𝘸 𝘦𝘹𝘱𝘦𝘤𝘵𝘢𝘵𝘪𝘰𝘯𝘴. 𝘛𝘩𝘦 𝘊𝘌𝘖 𝘩𝘢𝘴 𝘪𝘯𝘷𝘪𝘵𝘦𝘥 𝘺𝘰𝘶 𝘵𝘰 𝘩𝘦𝘭𝘱 𝘵𝘩𝘦𝘮 𝘰𝘶𝘵.

How would you approach this business problem?

When ready, check this video below where I present how to approach this problem.

BCG: Tips And Case Interview Examples

The Boston Consulting Group website  states something very important: the goal of the hiring process is to get to know you better, which means, in the context of Consulting interviews, understanding how you solve problems .

Remember this: in case interviews,  to show how you think is MUCH MORE IMPORTANT than to find an answer to the case .

As a result, you will have case study questions to showcase your problem-solving skills. Likewise, fit interviews have the same purpose: to show what problems you faced and how you resolved them.

• BCG interview prep tips
• BCG’s interactive case tool
• BCG case interview example: climate change challenge
• BCG case interview example: GenCo
• BCG case interview example: FoodCo

Check out the BCG Hub : A library of 20+ free resources that cover everything you need to secure a job offer at BCG.

Bain: Tips And Case Interview Examples

Bain & Company’s website highlights something very important: successful applicants manage to turn a case interview into a conversation between two consultants .

In other words, you don’t want to appear as a candidate but as a consultant !

To do this, you need to master the main problem-solving techniques that consulting firms want to see.

• Bain interview prep tips here and here
• Bain case interview examples: coffee , fashioco
• Bain case interview sample videos: a first video , a second video

Check out the Bain Hub : A library of 20+ free resources that cover everything you need to secure a job offer at Bain & Company.

Deloitte: Tips And Case Interview Examples

As for the BCG’s section above, the Deloitte website clearly states that in case interviews , it is much more important to show how you think and interact with your interviewer than to find the right answer to the case.

• Deloitte interview prep tips
• Deloitte case interview examples: here (more than 15 case interview examples)
• Deloitte case interview example: Federal Agency
• Deloitte case interview example: Recreation Unlimited
• Deloitte case interview example: Federal benefits Provider
• Deloitte case interview example: Federal Civil Cargo protection Bureau

Get 4 Complete Case Interview Courses For Free

You need 4 skills to be successful in all case interviews: Case Structuring, Case Leadership, Case Analytics, and Communication. Join this free training and learn how to ace ANY case questions.

Oliver Wyman: Tips And Case Interview Examples

Like the Deloitte website, Oliver Wyman’s website points out that, above all,  you must demonstrate your ability to think in a structured, analytical, and creative way.

In other words, there are no right or wrong answers, but only showing how you solve problems matters.

• Oliver Wyman interview prep tips
• Oliver Wyman case interview examples: here (Aqualine) and here (Wumbleworld)

Kearney: Tips And Case Interview Examples

Now it’s time to tell you something you could have heard a hundred times.

Yet too many candidates do it.

Do NOT force your solution to adapt to a standard framework . As a result, this will only take you to a place you don’t want to go: the pool of rejected candidates .

To learn more about this, check the “What Not To Do” section on the AT Kearney website .

• Kearney interview prep tips
• Kearney case interview examples: here and here
• Kearney case book: here

Strategy&: Interview Prep Tips

Strategy& doesn’t provide case study examples on its website, but it shares insights on career progression, which I recommend reading when you prepare for your fit interviews.

• Strategy& interview prep tips

Roland Berger: Tips And Case Interview Examples

I like the examples of case studies presented on the Roland Berger website .

Because the two examples of case studies are very detailed and illustrate the kind of solutions your interviewers expect during case discussions.

• Roland Berger interview prep tips
• A first Roland Berger case interview example: part 1 and part 2
• A second Roland Berger case interview example: part 1 and part 2

Alix Partners: Interview Prep Tips

Like Strategy&, Alix Partners doesn’t provide case study examples on its website.

However, they give an overview of what they are looking for: they want entrepreneurial, self-starter, and analytical candidates, which are skills that all consulting firms highly appreciate .

• Alix Partners interview prep tips

OC&C: Interview Prep Tips

Here are two case study examples from OC&C:

• Imported spirit
• Leisure clubs

253 Case Studies From Business School Case Books

Most of these 253 case study examples are based on case interviews used by consulting firms in real job interviews .

As a result, you can have a good idea of the case study questions you can have when interviewing at these firms .

The Full List Of 253 Free Case Study Examples

• Chicago business school
• Australian Graduate School of Management
• Columbia business school
• Harvard business school
• Wharton business school (2009)
• Wharton busines school (2017)
• Darden business school

Do you want to practice a specific type of case study? Now you can…

I have sorted this list of 253 case studies by type:  profitability, market expansion, industry analysis, pricing, investment or acquisition,  and guesstimates (also known as market sizing questions).

Bonus #1: Know The Types Of Cases You Are Likely To have During Your Interviews

• Profitability cases (29% of cases from that list)
• Investment cases (19% of cases from that list)
• Market sizing questions (15% of cases from that list)

As a result, assuming you’ll have 6 interviews (and therefore 6 case interviews) during the recruitment process:

• “Profitability cases are 29%”  means that chances to have 2 profitability case studies during your recruitment process are very high
• “Investment cases are 19%”  means that chances to have 1 investment case study during your recruitment process are very high.
• “ Guesstimates are 15%”  means that chances of having  1 market sizing question during your recruitment process are high.

Bonus #2: The 10 Cases I Recommend You Doing Now

Over 250 examples of case interviews are a great list, and you may not know where to start.

So, I’ve compiled a list of my 10 favorite case studies.

The 5 case studies I recommend doing if you are a BEGINNER

1. stern case book: drinks gone flat (starting at page 24).

This is a good introduction to a common type of case (declining sales here). I liked the solution presented for this case, particularly how it started by isolating declining sales (what range of products? Volumes or prices, or both?).

2. Stern case book: Sport bar (starting at page 46)

This is an investment case (should you invest in a new bar). Even if the solution presented in this case book is not MECE , it covers the most common quantitative questions you might have in such a case. I recommend doing this case.

3. Stern case book: MJ Wineries (starting at page 85)

This is a profitability case. I liked the solution presented in this case because it illustrates how specific good candidates should be. The case concerns wine, so a good candidate should mention the quality of lands and grapes as important factors.

4. AGSM case book: Piano tuners (starting at page 57)

This is a typical market sizing question. How to answer this type of question is a must-know before going to your interviews.

5. Darden case book: National Logistics (starting at page 49)

Again, this is a very common case (how to reduce costs). I liked the broad range of questions asked in this case, covering key skills assessed by consulting firms during case interviews: brainstorming skills (or creativity), quantitative skills, and business sense.

The 5 case studies I recommend if you are more ADVANCED in your preparation

1. stern: the pricing games (starting at page 55).

This case study asks you to help your client assess different business models. I liked this case because the range of issues to tackle is quite broad.

2. Wharton 2017: Engineer attrition at SLS Oil & Gas Services (starting at page 55)

I liked this case study because the case prompt is uncommon: your client has been facing a very high attrition rate among its population of Engineers. As a result, it’s very unlikely that your solution fits a well-known framework, and you’ll have to demonstrate your problem-solving skills by developing a specific solution.

3. Wharton 2017: Pharma Company Goes International, Outsources Benefits, Integrates New Technology (starting at page 95)

This case is about a client considering outsourcing a part of their activity. Even though I don’t know if this type of case study is very common, I had many case studies like this when I passed my interviews a few years ago. And I always found them difficult!

4. Insead: Gas retail case (starting at page 73)

The question in the problem statement is very broad, making this case difficult. So, only good candidates can have a structured case discussion here.

5. Darden: Fire Proof (starting at page 84)

This is a market entry case. Try to solve it by developing a structure as MECE as possible.

CareerInConsulting.com's Free Resources

Access my exclusive free training to help you prepare for your case interviews .

Besides, you can learn my step-by-step guide to answering market sizing questions .

You’ll get my formula to solve all market sizing questions.

Moreover, if you are a beginner, you can read my article on how to solve business cases (+ a 4-week prep plan to get case interview ready).

Also, check these 11 must-know frameworks to ace your case interviews.

Finally, you can read the articles in the blog section of my website.

That’s quite a list.

To complete this list, check this free case interview course , where you’ll find case questions recently asked in actual interviews.

Now, I’d like to hear from you.

Which key insights were new to you?

Or maybe I have missed something.

Either way, let me know by leaving a comment below.

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You need 4 skills to be successful in all case interviews: Case Structuring, Case Leadership, Case Analytics, and Communication. Enroll in our 4 free courses and discover the proven systems +300 candidates used to learn these 4 skills and land offers in consulting.

Hacking the Case Interview

We’ve compiled 50 case interview examples and organized them by industry, function, and consulting firm to give you the best, free case interview practice. Use these case interview examples for practice as you prepare for your consulting interviews.

If you’re looking for a step-by-step shortcut to learn case interviews quickly, enroll in our case interview course . These insider strategies from a former Bain interviewer helped 30,000+ land consulting offers while saving hundreds of hours of prep time.

Case Interview Examples Organized by Industry

Below, we’ve linked all of the case interview examples we could find from consulting firm websites and YouTube videos and organized them by industry. This will be helpful for your case interview practice if there is a specific consulting industry role that you are interviewing for that you need more practice in.

Aerospace, Defense, & Government Case Interview Examples

• Agency V (Deloitte)
• The Agency (Deloitte)
• Federal Finance Agency (Deloitte)
• Federal Civil Cargo Protection Bureau (Deloitte)

Consumer Products & Retail Case Interview Examples

• Electro-light (McKinsey)
• Beautify (McKinsey)
• Shops Corporation (McKinsey)
• Climate Case (BCG)
• Foods Inc. (BCG) *scroll to bottom of page
• Chateau Boomerang (BCG) *written case interview
• PrintCo (Bain)
• Coffee Co. (Bain)
• Fashion Co. (Bain)
• Recreation Unlimited (Deloitte)
• Footlose (Deloitte)
• National Grocery and Drug Store (Kearney)
• Whisky Co. (OC&C)
• Dry Cleaners (Accenture) *scroll to page 15
• UK Grocery Retail (Strategy&) *scroll to page 24
• Ice Cream Co. (Capital One)

Healthcare & Life Sciences Case Interview Examples

• GlobaPharm (McKinsey)
• GenCo (BCG) *scroll to middle of page
• PrevenT (BCG)
• MedX (Deloitte)
• Medical Consumables (LEK)
• Medicine Company (HackingTheCaseInterview)
• Pharma Company (Indian Institute of Management)

Manufacturing & Production Case Interview Examples

• Aqualine (Oliver Wyman)
• 3D Printed Hip Implants (Roland Berger)
• Talbot Trucks (McKinsey)
• Playworks (Yale School of Management)

Social & Non-Profit Case Interview Examples

• Diconsa (McKinsey)
• National Education (McKinsey)
• Conservation Forever (McKinsey)
• Federal Health Agency (Deloitte)
• Robinson Philanthropy (Bridgespan)
• Home Nurses for New Families (Bridgespan)
• Reach for the Stars (Bridgespan)
• Venture Philanthropy (Bridgespan)

Technology, Media, & Telecom Case Interview Examples

• NextGen Tech (Bain)
• Smart Phone Introduction (Simon-Kucher)
• MicroTechnos (HackingTheCaseInterview)

Transportation Case Interview Examples

• Low Cost Carrier Airline (BCG)
• Transit Oriented Development (Roland Berger)
• Northeast Airlines (HackingTheCaseInterview)
• A+ Airline Co. (Yale School of Management)
• Ryder (HackingTheCaseInterview)

Travel & Entertainment Case Interview Examples

• Wumbleworld (Oliver Wyman)
• Theater Co. (LEK)
• Hotel and Casino Co. (OC&C)

Case Interview Examples Organized by Function

Below, we’ve taken the same cases listed in the “Case Interview Examples Organized by Industry” section and organized them by function instead. This will be helpful for your case interview practice if there is a specific type of case interview that you need more practice with.

Profitability Case Interview Examples

To learn how to solve profitability case interviews, check out our video below:

Market Entry Case Interview Examples

Merger & acquisition case interview examples.

Growth Strategy Case Interview Examples

Pricing case interview examples.

New Product Launch Case Interview Examples

Market sizing case interview examples.

To learn how to solve market sizing case interviews, check out our video below:

Operations Case Interview Examples

Other case interview examples.

These are cases that don’t quite fit into any of the above categories. These cases are the more unusual, atypical, and nontraditional cases out there.

Case Interview Examples Organized by Consulting Firm

Below, we’ve taken the same cases listed previously and organized them by company instead. This will be helpful for your case interview practice if there is a specific company that you are interviewing with.

McKinsey Case Interview Examples

BCG Case Interview Examples

Bain Case Interview Examples

Deloitte Case Interview Examples

Lek case interview examples, kearney case interview examples, oliver wyman case interview examples, roland berger case interview examples, oc&c case interview  examples, bridgespan case interview examples, strategy& case interview examples, accenture case interview examples, simon kutcher case interview examples, capital one case interview examples, case interview examples from mba casebooks.

For more case interview examples, check out our article on 23 MBA consulting casebooks with 700+ free practice cases . There additional cases created by MBA consulting clubs that make for great case interview practice. For your convenience, we’ve listed some of the best MBA consulting casebooks below:

• Australian Graduate School of Management (2002)
• Booth (2005)
• Columbia (2007)
• Darden (2019)
• ESADE (2011)
• Fuqua (2018)
• Goizueta (2006)
• Haas (2019)
• Harvard Business School (2012)
• Illinois (2015)
• INSEAD (2011)
• Johnson (2003)
• Kellogg (2012)
• London Business School (2013)
• McCombs (2018)
• Notre Dame (2017)
• Queens (2019)
• Ross (2010)
• Sloan (2015)
• Stern (2018)
• Tuck (2009)
• Wharton (2017)
• Yale (2013)

Consulting casebooks are documents that MBA consulting clubs put together to help their members prepare for consulting case interviews. Consulting casebooks provide some case interview strategies and tips, but they mostly contain case interview practice cases.

While consulting casebooks contain tons of practice cases, there is quite a bit of variety in the sources and formats of these cases.

Some practice cases are taken from actual consulting interviews given by consulting firms. These are the best types of cases to practice with because they closely simulate the length and difficulty of an actual case interview. Other practice cases may be written by the consulting club’s officers. These cases are less realistic, but can still offer great practice.

The formats of the practice cases in consulting casebooks also vary significantly.

Some practice cases are written in a question and answer format. This type of format makes it easy to practice the case by yourself, without a case partner. Other practices cases are written in a dialogue format. These cases are better for practicing with a case interview partner.

MBA consulting casebooks can be a great resource because they are free and provide tons of practice cases to hone your case interview skills. However, there are several caveats that you should be aware of.

• Similarity to real case interviews : Some cases in MBA consulting casebooks are not representative of actual case interviews because they are written by consulting club officers instead of interviewers from consulting firms
• Quality of sample answers : While consulting casebooks provide sample solutions, these answers are often not the best or highest quality answers
• Ease of use : Consulting casebooks are all written in different formats and by different people. Therefore, it can be challenging to find cases that you can consistently use to practice cases by yourself or with a partner

Therefore, we recommend that you first use the case interview examples listed in this article and wait until you’ve exhausted all of them before using MBA consulting casebooks.

Case Interview Examples from HackingTheCaseInterview

Below, we've pulled together several of our very own case interview examples. You can use these case interview examples for your case interview practice.

1. Tech retailer profitability case interview

2. Airline profitability case interview

3. Ride sharing app market entry

4. Increasing Drug Adoption

How to Use Case Interview Examples to Practice Case Interviews

To get the most out of these case interview examples and maximize your time spent on case interview practice, follow these three steps.

1. Understand the case interview structure beforehand

If case interviews are something new to you, we recommend watching the following video to learn the basics of case interviews in under 30 minutes.

Know that there are seven major steps of a case interview.

• Understanding the case background : Take note while the interviewer gives you the case background information. Afterwards, provide a concise synthesis to confirm your understanding of the situation and objective
• Asking clarifying questions : Ask questions to better understand the case background and objective
• Structuring a framework : Lay out a framework of what areas you want to look into in order to answer or solve the case
• Kicking off the case : Propose an area of your framework that you would like to dive deeper into 
• Solving quantitative problems : Solve a variety of different quantitative problems, such as market sizing questions and profitability questions. You may also be given charts and graphs to analyze or interpret
• Answering qualitative questions : You may be asked to brainstorm ideas or be asked to give your business opinion on a particular issue or topic
• Delivering a recommendation : Summarize the key takeaways from the case to deliver a firm and concise recommendation

2. Learn how to practice case interviews by yourself 

There are 6 steps to practice case interviews by yourself. The goal of these steps is to simulate a real case interview as closely as you can so that you practice the same skills and techniques that you are going to use in a real case interview.

• Synthesize the case background information out loud : Start the practice case interview by reading the case background information. Then, just as you would do in a live case interview, summarize the case background information out loud
• Ask clarifying questions out loud : Just as you would do in a live case interview, ask clarifying questions out loud. Although you do not have a case partner that can answer your questions, it is important to practice identifying the critical questions that need to be asked to fully understand the case
• Structure a framework and present it out loud : Pretend that you are in an actual interview in which you’ll only have a few minutes to put together a comprehensive and coherent framework. Replicate the stress that you will feel in an interview when you are practicing case interviews on your own by giving yourself time pressure.

When you have finished creating your framework, turn your paper around to face an imaginary interviewer and walk through the framework out loud. You will need to get good at presenting your framework concisely and in an easy to understand way.

• Propose an area to start the case : Propose an area of your framework to start the case. Make sure to say out loud the reasons why you want to start with that particular area
• Answer each case question out loud : If the question is a quantitative problem, create a structure and walk the interviewer through how you would solve the problem. When doing math, do your calculations out loud and explain the steps that you are taking.

If the question is qualitative, structure your thinking and then brainstorm your ideas out loud. Walk the interviewer through your ideas and opinions.

• Deliver a recommendation out loud : Just as you would do in a real case interview, ask for a brief moment to collect your thoughts and review your notes. Once you have decided on a recommendation, present your recommendation to the interviewer.

3. Follow best practices while practicing case interviews :    

You’ll most likely be watching, reading, or working through these case interview examples by yourself. To get the most practice and learnings out of each case interview example, follow these tips: 

• Don’t have notes or a calculator out when you are practicing since you won’t have these in your actual interview
• Don’t take breaks in the middle of a mock case interview
• Don’t read the case answer until you completely finish answering each question
• Talk through everything out loud as if there were an interviewer in the room
• Occasionally record yourself to understand what you look like and sound like when you speak

4. Identify improvement areas to work on

When the case is completed, review your framework and answers and compare them to the model answers that the case provides. Reflect on how you could have made your framework or answers stronger.

Also, take the time to reflect on what parts of the case you could have done better. Could your case synthesis be more concise? Was your framework mutually exclusive and collectively exhaustive? Could your math calculations be done more smoothly? Was your recommendation structured enough?

This is the most important part of practicing case interviews by yourself. Since you have no partner to provide you feedback, you will need to be introspective and identify your own improvement areas.

At the end of each practice case interview, you should have a list of new things that you have learned and a list of improvement areas to work on in future practice cases. You’ll continue to work on your improvement areas in future practice cases either by yourself or with a partner.

5. Eventually find a case partner to practice with

You can only do so many practice case interviews by yourself before your learning will start to plateau. Eventually, you should be practicing case interviews with a case partner.

Practicing with a case partner is the best way to simulate a real case interview. There are many aspects of case interviews that you won’t be able to improve on unless you practice live with a partner:

• Driving the direction of the case
• Asking for more information
• Collaborating to get the right approach or structure
• Answering follow-up questions

If you are practicing with a case partner, decide who is going to be giving the case and who is going to be receiving the case.

If you are giving the case, read the entire case information carefully. It may be helpful to read through everything twice so that you are familiar with all of the information and can answer any question that your partner asks you to clarify.

As the person giving the case, you need to be the case expert.

You should become familiar with the overall direction of the case. In other words, you should know what the major questions of the case are and what the major areas of investigation are. This will help you run the mock case interview more smoothly.  

Depending on whether you want the case interview to be interviewer-led or candidate-led, you will need to decide how much you want to steer the direction of the case.

If your partner gets stuck and is taking a long time, you may need to step in and provide suggestions or hints. If your partner is proceeding down a wrong direction, you will need to direct them towards the right direction.

Where to Find More Case Interview Examples

To find more case interview examples, you can use a variety of different case interview prep books, online courses, and coaching. We'll cover each of these different categories of resources for more case interview practice in more detail.

Case Interview Prep Books

Case interview prep books are great resources to use because they are fairly inexpensive, only costing $20 to $30. They contain a tremendous amount of information that you can read, digest, and re-read at your own pace.

Based on our comprehensive review of the 12 popular case interview prep books , we ranked nearly all of the case prep books in the market.

The three case interview prep books we recommend using are:

• Hacking the Case Interview : In this book, learn exactly what to do and what to say in every step of the case interview. This is the perfect book for beginners that are looking to learn the basics of case interviews quickly.
• The Ultimate Case Interview Workbook : In this book, hone your case interview skills through 65+ problems tailored towards each type of question asked in case interviews and 15 full-length practice cases. This book is great for intermediates looking to get quality practice.
• Case Interview Secrets : This book provides great explanations of essential case interview concepts and fundamentals. The stories and anecdotes that the author provides are entertaining and help paint a clear picture of what to expect in a case interview, what interviewers are looking for, and how to solve a case interview.

Case Interview Courses

Case interview courses are more expensive to use than case interview prep books, but offer more efficient and effective learning. You’ll learn much more quickly from watching someone teach you the material, provide examples, and then walk through practice problems than from reading a book by yourself.

Courses typically cost anywhere between $200 to $400.

If you are looking for a single resource to learn the best case interview strategies in the most efficient way possible, enroll in our comprehensive case interview course .

Through 70+ concise video lessons and 20 full-length practice cases based on real interviews from top-tier consulting firms, you’ll learn step-by-step how to crush your case interview.

We’ve had students pass their consulting first round interview with just a week of preparation, but know that your success depends on the amount of effort you put in and your starting capabilities.

Case Interview Coaching

With case interview coaching, you’ll pay anywhere between $100 to $300 for a 40- to 60-minute mock case interview session with a case coach. Typically, case coaches are former consultants or interviewers that have worked at top-tier consulting firms.

Although very expensive, case interview coaching can provide you with high quality feedback that can significantly improve your case interview performance. By working with a case coach, you will be practicing high quality cases with an expert. You’ll get detailed feedback that ordinary case interview partners are not able to provide.

Know that you do not need to purchase case interview coaching to receive a consulting job offer. The vast majority of candidates that receive offers from top firms did not purchase case interview coaching. By purchasing case interview coaching, you are essentially purchasing convenience and learning efficiency.

Case interview coaching is best for those that have already learned as much as they can about case interviews on their own and feel that they have reached a plateau in their learning. For case interview beginners and intermediates, it may be a better use of their money to first purchase a case interview course or case interview prep book before purchasing expensive coaching sessions.

If you do decide to eventually use a case interview coach, consider using our case coaching service .

There is a wide range of quality among coaches, so ensure that you are working with someone that is invested in your development and success. If possible, ask for reviews from previous candidates that your coach has worked with.

Summary of the Best Consulting Interview Resources

Here are the resources we recommend to land your dream consulting job:

For help landing consulting interviews

• Resume Review & Editing : Transform your resume into one that will get you multiple consulting interviews

For help passing case interviews

• Comprehensive Case Interview Course (our #1 recommendation): The only resource you need. Whether you have no business background, rusty math skills, or are short on time, this step-by-step course will transform you into a top 1% caser that lands multiple consulting offers.
• Case Interview Coaching : Personalized, one-on-one coaching with a former Bain interviewer.
• Hacking the Case Interview Book   (available on Amazon): Perfect for beginners that are short on time. Transform yourself from a stressed-out case interview newbie to a confident intermediate in under a week. Some readers finish this book in a day and can already tackle tough cases.
• The Ultimate Case Interview Workbook (available on Amazon): Perfect for intermediates struggling with frameworks, case math, or generating business insights. No need to find a case partner – these drills, practice problems, and full-length cases can all be done by yourself.

For help passing consulting behavioral & fit interviews

• Behavioral & Fit Interview Course : Be prepared for 98% of behavioral and fit questions in just a few hours. We'll teach you exactly how to draft answers that will impress your interviewer.

Land Multiple Consulting Offers

Complete, step-by-step case interview course. 30,000+ happy customers.

• May 13, 2020

A Quick Guide to Preparing for a Case Study Interview

Recruiting & Careers Social Influencer

Reviewed by Chris Leitch

Invited to participate in a case study interview but not sure about the best ways to get ready for it?

As you always want to be at your very best when interviewing with a company, the case study interview requires a bit more preparation than recognising some of the common types of job interviews .

While you’ll still need to impress a prospective employer with strong research, confident interview responses and a professional appearance , the case study interview tests your knowledge and abilities through a spontaneous, analytical exercise. It examines how you approach problem-solving with the pressure of handling a situation without previous knowledge of any details or context.

Although the consulting industry utilises it as an essential part of the hiring process, the case study interview can be also found in many other environments, including startups, government and corporate organisations. It measures a candidate’s analytical, logic reasoning and communication abilities while under pressure.

In this guide, we will cover what you need to know to successfully prepare for a case study interview.

Case Study Interviews Explained

Even if you’ve never participated in one, it’s likely you’ve heard stories about the case study interview format. The case study puts you, the candidate, on the spot to solve a business problem posed by the interviewers.

Case study interview questions cover a wide range of topics and do not look for a single ‘right’ answer. Instead, the format gives the interviewers a look at how you respond spontaneously while applying problem-solving skills to create a solution to the business challenge presented.

For example, an exercise might ask what the potential market size is for a vegan food company within a prospective city and if setting up shop within the region would be worth it. The case study may not share all the details to help you reach an answer, but it should prompt you to ask questions that help you structure your thought process.

What to Expect in a Case Study Interview

The ways by which a case study interview is conducted will vary by company. However, this format bears unique characteristics:

• You’ll receive an introduction to the business problem, its relevant details and other information that lend to setting context. Some companies may choose to share a briefing document for you to read, while others may prefer to communicate the scenario in conversation.
• Information about the business problem will be, to some degree, vague. While the problem may cover complex business concepts, expect that the information will provide a high-level description of the scenario – not detailed reports with specific facts and figures. Case study interviews present such information in general terms for a reason. They’re meant to provide just enough information so that you can choose how to approach your line of questioning to solve the problem.
• The discussion about the business problem will be led by either the interviewer or the candidate. You need to be prepared for both situations. Who leads the conversation about the business problem is important, as it reveals the direction the discussion will take.

In interviewer-led sessions, the interviewer seeks to gauge the quality of your approach as it relates to a specific part of the business problem. They control the dialogue, focusing on a series of tough questions unlike those considered to be difficult in other interview formats . The interviewer sticks to a line of questioning that refers to details and themes relevant to the business problem, and evaluates how you comprehend, interpret and recommend actions within this specific domain.

On the hand, candidate-led conversations evaluate your ability to understand a business problem comprehensively, and from multiple points of view. Consultants play different roles on projects. Their actions cover various levels of activity, from analysing the business facts and data, creating the solutions and communicating directly with the clients on the overall strategy and approach. You’ll need to show strong methodology to guide others in your process.

Candidate-led sessions are challenging because they give you the freedom to explain your best approach to tackle the entire problem, but without receiving the input or comments of others to help guide a conversation along.

How to Prepare for a Case Study Interview

As you might find these interviews to be difficult, intense and downright nerve-wracking , you can succeed in a case study interview through thoughtful preparation. Here are five tips to help you ace the interview:

1. Demonstrate Your Analytical, Reasoning and Communication Skills

While recapping key details of the business problem is important, the case study interview measures much more than your ability to recall the facts. It showcases how you think on your feet as you seek out information to determine your course of action.

While you might be comfortable sketching out a framework or a mathematical formula that helps you identify the way you wish to solve the problem, this interview format also tests your ability to explain the reasoning in a clear and believable manner to others.

To be successful in a case study interview, you must demonstrate the skill to process information quantitatively, as well as speak about your rationale and decisions convincingly.

2. Get Ready to Play an Active Role in the Discussion

Case study interviews require a high level of engagement. While other interviews might have you responding to questions with rehearsed answers, the case study interview presents a situation that is dynamic and unpredictable.

You’ll want to approach the session with an active disposition. This typically includes taking notes, documenting your observations and ideas, sketching out diagrams and charts, and asking follow-up questions throughout the interview .

3. Identify the Type of Problem Posed to You

Jobseekers may find that there are common themes that appear when covering the type of business problems found in case study interviews. Eight of the most common exercises explore these questions:

• Maths – eg: ‘How many more units do we need to sell to double the profit?’
• Market size – eg: ‘How big is the market size within the US for smart wearable devices?’
• Framework/Issue tree - eg: ‘Identify the factors you would consider in addressing the problem.’
• Data-chart insights – eg: ‘What story do the numbers tell about the operations of this business?’
• Value proposition – eg: ‘What factors do customers look for in choosing a mobile phone carrier?’
• Business valuation – eg: ‘Just how much is this company worth today, and would it change if acquired by our competitor?’
• Hypothesis – eg: ‘What are some possible reasons that explain this trend?’
• Brain teaser – eg: ‘How many tennis balls can you fit in an area that is twice the size of a football field?’

There is not a single approach that solves all business problems. By identifying the type of problem you’re encountering, you’ll be able to quickly determine the most appropriate method to apply.

For example, you might discover that a maths problem will rely on the knowledge of specific formulas and expressions, while a hypothesis question calls for a closer look at the root causes behind an issue.

4. Organise a Framework that Helps You Solve the Problem

Having a good framework to apply to a problem is the key to doing well in a case study interview. You want to show that you understand a business issue well enough to formulate recommendations or insights that address the problem. As there isn’t one right answer to such a problem, your interviewer will be interested to hear about the thought process you applied to arrive at your decisions.

The process may involve a range of problem-solving skills and methods, including the use of mathematical formulas, first-hand knowledge about an industry and decision-tree flowcharts that guide through questions you’ve applied to the issue.

It’s helpful to write down your framework and refer to it as needed. By having the steps outlined, you’ll be able to explain your recommendations in a clear and confident manner so that the rationale used in your analysis appears sound.

5. Practise, Practise, Practise!

Prepare for the case study interview by engaging in mock practice sessions before the big day. While it’s important to spend time putting together the methods you’ll use to analyse a business problem, enlisting the help of a friend or two familiar with this interview format is essential.

You’ll want to find case study examples online and share your selections with those helping you practise. Your friends should read the materials before the practice sessions and play the role of the interviewer.

By conducting a practice session as if it were the real thing, your friends will help you work through the awkwardness and spontaneity of the case study interview and develop the confidence to perform successfully.

By following these tips, you’ll be ready to show off your analytical, communication and problem-solving skills, all important to the case study interview. However, don’t limit your preparation only to the guidance given for this specific style; rather, you’ll want to make sure you continue the things that served you well for other interview formats, including making a good first impression and avoiding interview faux pas .

By combining those behaviours with the preparation, mindset and practice needed to solve business problems on your feet, you’ll put yourself in a great position to succeed at a case study interview.

Have you ever found yourself in a case study interview? What advice do you have to give? Let us know in the comments section below!

Interview Preparation

Finding a Job

Interview Formats

100 Best Case Study Questions for Your Next Customer Spotlight

Published: November 29, 2022

Case studies and testimonials are helpful to have in your arsenal. But to build an effective library, you need to ask the right case study questions. You also need to know how to write a case study .

Case studies are customers' stories that your sales team can use to share relevant content with prospects . Not only that, but case studies help you earn a prospect's trust, show them what life would be like as your customer, and validate that your product or service works for your clients.

Before you start building your library of case studies, check out our list of 100 case study questions to ask your clients. With this helpful guide, you'll have the know-how to build your narrative using the " Problem-Agitate-Solve " Method.

What makes a good case study questionnaire?

The ultimate list of case study questions, how to ask your customer for a case study, creating an effective case study.

Certain key elements make up a good case study questionnaire.

A questionnaire should never feel like an interrogation. Instead, aim to structure your case study questions like a conversation. Some of the essential things that your questionnaire should cover include:

• The problem faced by the client before choosing your organization.
• Why they chose your company.
• How your product solved the problem clients faced.
• The measurable results of the service provided.
• Data and metrics that prove the success of your service or product, if possible.

You can adapt these considerations based on how your customers use your product and the specific answers or quotes that you want to receive.

What makes a good case study question?

A good case study question delivers a powerful message to leads in the decision stage of your prospective buyer's journey.

Since your client has agreed to participate in a case study, they're likely enthusiastic about the service you provide. Thus, a good case study question hands the reins over to the client and opens a conversation.

Try asking open-ended questions to encourage your client to talk about the excellent service or product you provide.

Free Case Study Templates

Tell us about yourself to access the templates..

Categories for the Best Case Study Questions

• Case study questions about the customer's business
• Case study questions about the environment before the purchase
• Case study questions about the decision process
• Case study questions about the customer's business case
• Case study questions about the buying team and internal advocates
• Case study questions about customer success
• Case study questions about product feedback
• Case study questions about willingness to make referrals
• Case study question to prompt quote-worthy feedback
• Case study questions about the customers' future goals

Showcase your company's success using these three free case study templates.

• Data-Driven Case Study Template
• Product-Specific Case Study Template
• General Case Study Template

Download Free

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Case Study Interview Questions About the Customer's Business

Knowing the customer's business is an excellent way of setting the tone for a case study.

Use these questions to get some background information about the company and its business goals. This information can be used to introduce the business at the beginning of the case study — plus, future prospects might resonate with their stories and become leads for you.

• Would you give me a quick overview of [company]? This is an opportunity for the client to describe their business in their own words. You'll get useful background information and it's an easy prompt to get the client talking.
• Can you describe your role? This will give you a better idea of the responsibilities they are subject to.
• How do your role and team fit into the company and its goals? Knowing how the team functions to achieve company goals will help you formulate how your solution involves all stakeholders.
• How long has your company been in business? Getting this information will help the reader gauge if pain points are specific to a startup or new company vs. a veteran company.
• How many employees do you have? Another great descriptor for readers to have. They can compare the featured company size with their own.
• Is your company revenue available? If so, what is it? This will give your readers background information on the featured company's gross sales.
• Who is your target customer? Knowing who the target audience is will help you provide a better overview of their market for your case study readers.
• How does our product help your team or company achieve its objectives? This is one of the most important questions because it is the basis of the case study. Get specifics on how your product provided a solution for your client. You want to be able to say "X company implemented our solution and achieved Y. "
• How are our companies aligned (mission, strategy, culture, etc.)? If any attributes of your company's mission or culture appealed to the client, call it out.

How many people are on your team? What are their roles? This will help describe key players within the organization and their impact on the implementation of your solution.

Case Study Interview Questions About the Environment Before the Purchase

A good case study is designed to build trust. Ask clients to describe the tools and processes they used before your product or service. These kinds of case study questions will highlight the business' need they had to fulfill and appeal to future clients.

• What was your team's process prior to using our product? This will give the reader a baseline to compare the results for your company's product.
• Were there any costs associated with the process prior to using our product? Was it more expensive? Was it worth the cost? How did the product affect the client's bottom line? This will be a useful metric to disclose if your company saved the client money or was more cost-efficient.
• What were the major pain points of your process prior to using our product? Describe these obstacles in detail. You want the reader to get as much information on the problem as possible as it sets up the reasoning for why your company's solution was implemented.
• Did our product replace a similar tool or is this the first time your team is using a product like this? Were they using a similar product? If so, having this information may give readers a reason to choose your brand over the competition.
• What other challenges were you and your team experiencing prior to using our product? The more details you can give readers regarding the client's struggles, the better. You want to paint a full picture of the challenges the client faced and how your company resolved them.
• Were there any concerns about how your customers would be impacted by using our product? Getting answers to this question will illustrate to readers the client's concerns about switching to your service. Your readers may have similar concerns and reading how your client worked through this process will be helpful.
• Why didn't you buy our product or a similar product earlier? Have the client describe any hesitations they had using your product. Their concerns may be relatable to potential leads.
• Were there any "dealbreakers" involved in your decision to become a customer? Describing how your company was able to provide a solution that worked within those parameters demonstrates how accommodating your brand is and how you put the customer first. It's also great to illustrate any unique challenges the client had. This better explains their situation to the reader.
• Did you have to make any changes you weren't anticipating once you became a customer? Readers of your case study can learn how switching to your product came with some unexpected changes (good or bad) and how they navigated them. If you helped your client with troubleshooting, ask them to explain that here.

How has your perception of the product changed since you've become a customer? Get the interviewee to describe how your product changed how they do business. This includes how your product accomplished what they previously thought was impossible.

Case Study Interview Questions About the Decision Process

Readers of the case study will be interested in which factors influenced the decision-making process for the client. If they can relate to that process, there's a bigger chance they'll buy your product.

The answers to these questions will help potential customers through their decision-making process.

• How did you hear about our product? If the client chose to work with you based on a recommendation or another positive case study, include that. It will demonstrate that you are a trusted brand with an established reputation for delivering results.
• How long had you been looking for a solution to this problem? This will add to the reader's understanding of how these particular challenges impacted the company before choosing your product.
• Were you comparing alternative solutions? Which ones? This will demonstrate to readers that the client explored other options before choosing your company.
• Would you describe a few of the reasons you decided to buy our product? Ask the interviewee to describe why they chose your product over the competition and any benefits your company offered that made you stand out.
• What were the criteria you used when deciding to buy our product? This will give readers more background insight into the factors that impacted their decision-making process.
• Were there any high-level initiatives or goals that prompted the decision to buy? For example, was this decision motivated by a company-wide vision? Prompt your clients to discuss what lead to the decision to work with you and how you're the obvious choice.
• What was the buying process like? Did you notice anything exceptional or any points of friction? This is an opportunity for the client to comment on how seamless and easy you make the buying process. Get them to describe what went well from start to finish.
• How would you have changed the buying process, if at all? This is an opportunity for you to fine-tune your process to accommodate future buyers.
• Who on your team was involved in the buying process? This will give readers more background on the key players involved from executives to project managers. With this information, readers can see who they may potentially need to involve in the decision-making process on their teams.

Case Study Interview Questions About the Customer's Business Case

Your case study questions should ask about your product or solution's impact on the customer's employees, teams, metrics, and goals. These questions allow the client to praise the value of your service and tell others exactly what benefits they derived from it.

When readers review your product or service's impact on the client, it enforces the belief that the case study is credible.

• How long have you been using our product? This will help readers gauge how long it took to see results and your overall satisfaction with the product or service.
• How many different people at your company use our product? This will help readers gauge how they can adapt the product to their teams if similar in size.
• Are there multiple departments or teams using our product? This will demonstrate how great of an impact your product has made across departments.
• How do you and your team currently use the product? What types of goals or tasks are you using the product to accomplish? Get specifics on how the product actively helps the client achieve their goals.
• If other teams or departments are using our product, do you know how they're using it? With this information, leads can picture how they can use your product across their teams and how it may improve their workflow and metrics.
• What was the most obvious advantage you felt our product offered during the sales process? The interviewee should explain the benefits they've gained from using your product or service. This is important for convincing other leads you are better than the competition.
• Were there any other advantages you discovered after using the product more regularly? Your interviewee may have experienced some additional benefits from using your product. Have them describe in detail what these advantages are and how they've helped the company improve.
• Are there any metrics or KPIs you track with our product? What are they? The more numbers and data the client can provide, the better.
• Were you tracking any metrics prior to using our product? What were they? This will allow readers to get a clear, before-and-after comparison of using your product.
• How has our product impacted your core metrics? This is an opportunity for your clients to drive home how your product assisted them in hitting their metrics and goals.

Case Study Interview Questions About the Buying Team and Internal Advocates

See if there are any individuals at the customer's company who are advocates for your product.

• Are there any additional team members you consider to be advocates for our product? For example, does anyone stick out as a "power user" or product expert on your team? You may want to interview and include these power users in your case study as well. Consider asking them for tips on using your service or product.
• Is there anyone else on your team you think we should talk to? Again, the more people can share their experience using your product, the better.
• Are there any team members who you think might not be the biggest fans of our product or who might need more training? Providing extra support to those struggling with your product may improve their user experience and turn into an opportunity to not only learn about their obstacles but turn them into a product fan
• Would you share some details about how your team implemented our product? Get as much information as possible about the rollout. Hopefully, they'll gush about how seamless the process was.
• Who from your company was involved in implementing our product? This will give readers more insight into who needs to be involved for a successful rollout of their own.
• Were there any internal risks or additional costs involved with implementing our product? If so, how did you address them? This will give insight into the client's process and rollout and this case study question will likely provide tips on what potential leads should be on the lookout for.
• Is there a training process in place for your team's use of our product? If so, what does it look like? If your company provided support and training to the client, have them describe that experience.
• About how long does it take a new team member to get up to speed with our product? This will help leads determine how much time it will take to onboard an employee to your using your product. If a new user can quickly get started seamlessly, it bodes well for you.
• What was your main concern about rolling this product out to your company? Describing their challenges in detail will provide readers with useful insight.

Case Study Interview Questions About Customer Success

Has the customer found success with your product? Ask these questions to learn more.

• By using our product can you measure any reduced costs? If it has, you'll want to emphasize those savings in your case study.
• By using our product can you measure any improvements in productivity or time savings? Any metrics or specific stories your interviewee can provide will help demonstrate the value of your product.
• By using our product can you measure any increases in revenue or growth? Again, say it with numbers and data whenever possible.
• Are you likely to recommend our product to a friend or colleague? Recommendations from existing customers are some of the best marketing you can get.
• How has our product impacted your success? Your team's success? Getting the interviewee to describe how your product played an integral role in solving their challenges will show leads that they can also have success using your product.
• In the beginning, you had XYZ concerns; how do you feel about them now? Let them explain how working with your company eliminated those concerns.
• I noticed your team is currently doing XYZ with our product. Tell me more about how that helps your business. Illustrate to your readers how current customers are using your product to solve additional challenges. It will convey how versatile your product is.
• Have you thought about using our product for a new use case with your team or at your company? The more examples of use cases the client can provide, the better.
• How do you measure the value our product provides? Have the interviewee illustrate what metrics they use to gauge the product's success and how. Data is helpful, but you should go beyond the numbers. Maybe your product improved company morale and how teams work together.

Case Study Interview Questions About Product Feedback

Ask the customer if they'd recommend your product to others. A strong recommendation will help potential clients be more open to purchasing your product.

• How do other companies in this industry solve the problems you had before you purchased our product? This will give you insight into how other companies may be functioning without your product and how you can assist them.
• Have you ever talked about our product to any of your clients or peers? What did you say? This can provide you with more leads and a chance to get a referral.
• Why would you recommend our product to a friend or client? Be sure they pinpoint which features they would highlight in a recommendation.
• Can you think of any use cases your customers might have for our product? Similar industries may have similar issues that need solutions. Your interviewee may be able to provide a use case you haven't come up with.
• What is your advice for other teams or companies who are tackling problems similar to those you had before you purchased our product? This is another opportunity for your client to talk up your product or service.
• Do you know someone in X industry who has similar problems to the ones you had prior to using our product? The client can make an introduction so you can interview them about their experience as well.
• I noticed you work with Company Y. Do you know if they are having any pain points with these processes? This will help you learn how your product has impacted your client's customers and gain insight into what can be improved.
• Does your company participate in any partner or referral programs? Having a strong referral program will help you increase leads and improve customer retention.
• Can I send you a referral kit as a thank-you for making a referral and give you the tools to refer someone to us? This is a great strategy to request a referral while rewarding your existing customers.
• Are you interested in working with us to produce additional marketing content? The more opportunities you can showcase happy customers, the better.

Case Study Interview Questions About Willingness to Make Referrals

• How likely are you to recommend our product to a friend or client? Ideally, they would definitely refer your product to someone they know.
• Can you think of any use cases your customers might have for our product? Again, your interviewee is a great source for more leads. Similar industries may have similar issues that need solutions. They may be able to provide a use case you haven't come up with.
• I noticed you work with Company Y; do you know if they are having any pain points with these processes? This will help you learn how your product has impacted your client's customers and gain insight into what can be improved.

Case Study Interview Questions to Prompt Quote-Worthy Feedback

Enhance your case study with quotable soundbites from the customer. By asking these questions, prospects have more insight into other clients and their success with your product — which helps build trust.

• How would you describe your process in one sentence prior to using our product? Ideally, this sentence would quickly and descriptively sum up the most prominent pain point or challenge with the previous process.
• What is your advice to others who might be considering our product? Readers can learn from your customer's experience.
• What would your team's workflow or process be like without our product? This will drive home the value your product provides and how essential it is to their business.
• Do you think the investment in our product was worthwhile? Why? Have your customer make the case for the value you provide.
• What would you say if we told you our product would soon be unavailable? What would this mean to you? Again, this illustrates how integral your product is to their business.
• How would you describe our product if you were explaining it to a friend? Your customers can often distill the value of your product to their friends better than you can.
• What do you love about your job? Your company? This gives the reader more background on your customer and their industry.
• What was the worst part of your process before you started using our product? Ideally, they'd reiterate how your product helped solve this challenge.
• What do you love about our product? Another great way to get the customer's opinion about what makes your product worth it.
• Why do you do business with us? Hopefully, your interviewee will share how wonderful your business relationship is.

Case Study Interview Questions About the Customers' Future Goals

Ask the customer about their goals, challenges, and plans for the future. This will provide insight into how a business can grow with your product.

• What are the biggest challenges on the horizon for your industry? Chances are potential leads within the same industry will have similar challenges.
• What are your goals for the next three months? Knowing their short-term goals will enable your company to get some quick wins for the client.
• How would you like to use our product to meet those challenges and goals? This will help potential leads understand that your product can help their business as they scale and grow.
• Is there anything we can do to help you and your team meet your goals? If you haven't covered it already, this will allow your interviewee to express how you can better assist them.
• Do you think you will buy more, less, or about the same amount of our product next year? This can help you gauge how your product is used and why.
• What are the growth plans for your company this year? Your team? This will help you gain insight into how your product can help them achieve future goals.
• How can we help you meet your long-term goals? Getting specifics on the needs of your clients will help you create a unique solution designed for their needs.
• What is the long-term impact of using our product? Get their feedback on how your product has created a lasting impact.
• Are there any initiatives that you personally would like to achieve that our product or team can help with? Again, you want to continue to provide products that help your customers excel.
• What will you need from us in the future? This will help you anticipate the customer's business needs.
• Is there anything we can do to improve our product or process for working together in the future? The more feedback you can get about what is and isn't working, the better.

Before you can start putting together your case study, you need to ask your customer's permission.

If you have a customer who's seen success with your product, reach out to them. Use this template to get started:

Thank you & quick request

Hi [customer name],

Thanks again for your business — working with you to [solve X, launch Y, take advantage of Z opportunity] has been extremely rewarding, and I'm looking forward to more collaboration in the future.

[Name of your company] is building a library of case studies to include on our site. We're looking for successful companies using [product] to solve interesting challenges, and your team immediately came to mind. Are you open to [customer company name] being featured?

It should be a lightweight process — [I, a product marketer] will ask you roughly [10, 15, 20] questions via email or phone about your experience and results. This case study will include a blurb about your company and a link to your homepage (which hopefully will make your SEO team happy!)

In any case, thank you again for the chance to work with you, and I hope you have a great week.

[Your name]

If one of your customers has recently passed along some praise (to you, their account manager, your boss; on an online forum; to another potential customer; etc.), then send them a version of this email:

Hey [customer name],

Thanks for the great feedback — I'm really glad to hear [product] is working well for you and that [customer company name] is getting the results you're looking for.

My team is actually in the process of building out our library of case studies, and I'd love to include your story. Happy to provide more details if you're potentially interested.

Either way, thank you again, and I look forward to getting more updates on your progress.

You can also find potential case study customers by usage or product data. For instance, maybe you see a company you sold to 10 months ago just bought eight more seats or upgraded to a new tier. Clearly, they're happy with the solution. Try this template:

I saw you just [invested in our X product; added Y more users; achieved Z product milestone]. Congratulations! I'd love to share your story using [product] with the world -- I think it's a great example of how our product + a dedicated team and a good strategy can achieve awesome results.

Are you open to being featured? If so, I'll send along more details.

Case Study Benefits

• Case studies are a form of customer advocacy.
• Case studies provide a joint-promotion opportunity.
• Case studies are easily sharable.
• Case studies build rapport with your customers.
• Case studies are less opinionated than customer reviews.

1. Case studies are a form of customer advocacy.

If you haven't noticed, customers aren't always quick to trust a brand's advertisements and sales strategies.

With every other brand claiming to be the best in the business, it's hard to sort exaggeration from reality.

This is the most important reason why case studies are effective. They are testimonials from your customers of your service. If someone is considering your business, a case study is a much more convincing piece of marketing or sales material than traditional advertising.

2. Case studies provide a joint-promotion opportunity.

Your business isn't the only one that benefits from a case study. Customers participating in case studies benefit, too.

Think about it. Case studies are free advertisements for your customers, not to mention the SEO factor, too. While they're not promoting their products or services, they're still getting the word out about their business. And, the case study highlights how successful their business is — showing interested leads that they're on the up and up.

3. Case studies are easily sharable.

No matter your role on the sales team, case studies are great to have on hand. You can easily share them with leads, prospects, and clients.

Whether you embed them on your website or save them as a PDF, you can simply send a link to share your case study with others. They can share that link with their peers and colleagues, and so on.

Case studies can also be useful during a sales pitch. In sales, timing is everything. If a customer is explaining a problem that was solved and discussed in your case study, you can quickly find the document and share it with them.

4. Case studies build rapport with your customers.

While case studies are very useful, they do require some back and forth with your customers to obtain the exact feedback you're looking for.

Even though time is involved, the good news is this builds rapport with your most loyal customers. You get to know them on a personal level, and they'll become more than just your most valuable clients.

And, the better the rapport you have with them, the more likely they'll be to recommend your business, products, or services to others.

5. Case studies are less opinionated than customer reviews.

Data is the difference between a case study and a review. Customer reviews are typically based on the customer's opinion of your brand. While they might write a glowing review, it's completely subjective and there's rarely empirical evidence supporting their claim.

Case studies, on the other hand, are more data-driven. While they'll still talk about how great your brand is, they support this claim with quantitative data that's relevant to the reader. It's hard to argue with data.

An effective case study must be genuine and credible. Your case study should explain why certain customers are the right fit for your business and how your company can help meet their specific needs. That way, someone in a similar situation can use your case study as a testimonial for why they should choose your business.

Use the case study questions above to create an ideal customer case study questionnaire. By asking your customers the right questions, you can obtain valuable feedback that can be shared with potential leads and convert them into loyal customers.

Editor’s Note: This article was originally published in June 2021 and has been updated for comprehensiveness.

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Case study definition

Case study, a term which some of you may know from the "Case Study of Vanitas" anime and manga, is a thorough examination of a particular subject, such as a person, group, location, occasion, establishment, phenomena, etc. They are most frequently utilized in research of business, medicine, education and social behaviour. There are a different types of case studies that researchers might use:

• Collective case studies

• Descriptive case studies

• Explanatory case studies

• Exploratory case studies

• Instrumental case studies

• Intrinsic case studies

Case studies are usually much more sophisticated and professional than regular essays and courseworks, as they require a lot of verified data, are research-oriented and not necessarily designed to be read by the general public.

How to write a case study?

It very much depends on the topic of your case study, as a medical case study and a coffee business case study have completely different sources, outlines, target demographics, etc. But just for this example, let's outline a coffee roaster case study. Firstly, it's likely going to be a problem-solving case study, like most in the business and economics field are. Here are some tips for these types of case studies:

• Your case scenario should be precisely defined in terms of your unique assessment criteria.

• Determine the primary issues by analyzing the scenario. Think about how they connect to the main ideas and theories in your piece.

• Find and investigate any theories or methods that might be relevant to your case.

• Keep your audience in mind. Exactly who are your stakeholder(s)? If writing a case study on coffee roasters, it's probably gonna be suppliers, landlords, investors, customers, etc.

• Indicate the best solution(s) and how they should be implemented. Make sure your suggestions are grounded in pertinent theories and useful resources, as well as being realistic, practical, and attainable.

• Carefully proofread your case study. Keep in mind these four principles when editing: clarity, honesty, reality and relevance.

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• Open access
• Published: 11 September 2024

Implementing peer support into practice in mental health services: a qualitative comparative case study

• Steve Gillard 1 ,
• Rhiannon Foster 1 ,
• Sarah White 2 ,
• Rahul Bhattacharya 3 ,
• Paul Binfield 3 ,
• Rachel Eborall 4 ,
• Sarah L Gibson 5 ,
• Daniella Harnett 3 ,
• Alan Simpson 6 ,
• Mike Lucock 7 ,
• Jacqueline Marks 8 ,
• Julie Repper 9 ,
• Miles Rinaldi 10 , 11 ,
• Anthony Salla 1 &
• Jessica Worner 12  

BMC Health Services Research volume  24 , Article number:  1050 ( 2024 ) Cite this article

Metrics details

Peer workers are people with personal experience of mental distress, employed within mental health services to support others with similar experiences. Research has identified a range of factors that might facilitate or hinder the introduction of new peer worker roles into mental health services. While there is mixed evidence for the effectiveness of peer worker delivered interventions, there are no studies exploring how implementation might be associated with effect.

This was a qualitative comparative case study using data from interviews with 20 peer workers and their five supervisors. Peer workers delivered peer support for discharge from inpatient to community mental health care as part of a randomised controlled trial. In the trial, level of participant engagement with peer support was associated with better outcome (hospital readmission). Study sites with higher levels of engagement also had higher scores on a measure of fidelity to peer support principles. We compared data from sites with contrasting levels of engagement and fidelity using an analytical framework derived from implementation theory.

In high engagement-high fidelity sites, there was regular work with clinical teams preparing for working alongside peer workers, and a positive relationship between staff on inpatient wards and peer workers. The supervisor role was well resourced, and delivery of peer support was highly consistent with the intervention manual. In low engagement-low fidelity sites peer workers were employed in not-for-profit organisations to support people using public mental health services and in rural areas. Supervisors faced constrained resources and experienced barriers to joint working between organisations. In these sites, peer workers could experience challenging relationships with ward staff. Issues of geography and capacity limited opportunities for supervision and team-building, impacting consistency of delivery.

Conclusions

This study provides clear indication that implementation can impact delivery of peer support, with implications for engagement and, potentially, outcomes of peer worker interventions. Resourcing issues can have knock-on effects on consistency of delivery, alongside challenges of access, authority and relationship with clinical teams, especially where peer workers were employed in not-for-profit organisations. Attention needs to be paid to the impact of geography on implementation.

Trial registration

ISRCTN registry number ISRCTN10043328, registered 28 November 2016.

Peer Review reports

Peer support in mental health services

People with personal experience of mental distress, often referred to as peer workers, are increasingly employed within mental health services internationally to support others with similar experiences. An extensive literature explores a range of implementation issues that might dilute the distinctive qualities of peer support when introduced into public mental health services [ 1 , 2 ]. These include adequate provision of role specific training for PWs, [ 3 , 4 ] support and supervision for PWs, [ 5 ] clarity of expectation around the way in which PWs bring experience-based knowledge to mental healthcare, [ 2 . 6 ] and preparation of clinical teams to work alongside PWs [ 7 ]. It has been argued that ‘over-professionalisation’ or ‘institutionalisation’ of the PW role constrains the distinctive contribution of peer support [ 8 , 9 , 10 , 11 ].

Trials of peer support in mental health services continue to demonstrate inconsistent results, with some studies indicating that peer support might be superior to care-as-usual or a comparator intervention, [ 12 , 13 ] while others indicate no difference in effect [ 14 , 15 ]. Some of this variation might be explained by heterogeneity of interventions, population or outcome, but it is also possible that the quality of implementation of peer support into mental healthcare settings is associated with the effect of peer support interventions [ 16 , 17 ].

It has been noted that peer support is often poorly described in the trial literature, [ 17 , 18 ] with a lack of research assessing association between implementation and outcome. A recent review of one-to-one peer support in mental health services categorised peer support as being well implemented where at least two of the following criteria were reported: dedicated peer support training; clear description of the underlying processes of peer support; well-defined support structures for PWs (e.g. supervision) [ 19 ]. However, only a small number of studies reported sufficient data to conduct an analysis and results were unclear. There is a need for research that explicitly considers the possible relationship between quality of implementation and the outcomes of peer support.

Implementation theory

Implementation science offers a range of frameworks for understanding the facilitators and barriers to successful implementation of healthcare innovation into practice [ 20 ]. There is a clear recognition that the effects of any intervention will always depend on successful implementation [ 21 ]. The well-established Promoting Action on Research Implementation in Health Services (PARIHS) framework conceptualises successful implementation of research-based innovation into healthcare in terms of the nature of the evidence on which the innovation is based, the context or environment into which the innovation is placed, and the method by which implementation is facilitated [ 22 ]. In recent years, the co-design [ 23 ] or coproduction [ 24 ] of new interventions in mental health has gained prominence, with people who use mental health services bringing experience-based knowledge to the process, alongside the professional and practice-based knowledge brought by healthcare professionals. Given that this experiential knowledge is core to peer support, and that a number of members of the research term brought their own experiences of mental distress and/ or of using mental health services to the design and conduct of the research, we adapted the PARIHS framework for the purposes of this study. An earlier scoping review of implementation literature and an empirical case study, [ 25 ] undertaken by members of the team (SG and RF), identified five domains where experiential knowledge might impact research implementation, and we mapped these domains directly onto the framework (Table  1 ).

The ENRICH trial

A trial of peer support for discharge from inpatient to community mental health care indicated that peer support was not superior to care-as-usual (follow up by community mental health services within seven days of discharge) in terms of either the primary outcome – readmission within 12 months of discharge – or a range of secondary outcomes [ 26 ]. PWs received eight days of training focused on individual strengths and connecting to community, met the people they were supporting at least once while still inpatients and then weekly for up to four months post-discharge. Peer support was flexible and collaborative, informed by a peer support principles framework [ 27 ]. PWs received group and individual supervision from an experienced peer worker coordinator (PWC) who had access to an action learning set with other PWCs across study sites. The trial and intervention are described in detail in a protocol paper [ 28 ].

Findings from the trial indicated that 62.5% of participants offered peer support had at least two contacts with their PW, at least one of which was post-discharge, and that those participants were significantly less likely to be readmitted than a similar group of PWs in the care-as-usual group [ 26 ]. There might be many reasons why people chose not to, or were unable to engage with their PW, including the possibility that peer support was not always well implemented into practice in the trial.

This paper aims to explore if and how levels of engagement in a new peer support intervention were associated with implementation of the intervention, and therefore how implementation of peer support in mental health services might be optimised in the future.

Study design

We take a comparative case study approach, informed by case-orientated Qualitative Comparative Analysis [ 29 ] and pattern-matching [ 30 ] techniques, considering the seven sites where the study took place as cases. Sites were National Health Services (NHS) mental health trusts (public healthcare provider organisations) in England, where the new peer support intervention was delivered as part of the ENRICH trial. Sites were selected to provide contrast in urban, town and rural localities, geographical spread across England, and where mental health trusts were committed to introducing new PW roles into mental health services. In most sites PWs were directly employed by the mental health trust, while in others a much smaller, voluntary (not-for-profit) sector organisation was sub-contracted by the trust to employ PWs to provide support to people using mental health trust services. Information about each site is given in Table  2 below.

To inform case selection for the comparative analysis we charted level of engagement at each site – percentage of trial participants offered peer support who had at least two contacts with their PW, at least one of which was post-discharge – against site fidelity score, measured using an index designed to assess fidelity of delivery of peer support at site level against a set of principles articulating what is distinctive about peer support compared to other forms of mental health support [ 31 ] (Fig.  1 ). Fidelity was assessed through a semi-structured interview with PWs, the people they supported and their supervisor, rated by researchers against criteria based on the principles framework. A high fidelity score indicates that peer support had been implemented according to those principles. Fidelity was assessed after peer support had been delivered for at least six months at each site.

Relationship between engagement with peer support and fidelity

Figure  1 is indicative of a direct relationship between engagement with peer support and fidelity, offering rationale for selecting sites with higher or lower levels of both engagement and fidelity as cases for comparative analysis. There was one outlier, site 2, where fidelity was high (11) but engagement was mid-range (51%). We included this site in the comparative analysis as engagement might be explained by implementation issues not related to fidelity of delivery.

We report on the Evidence domain of the framework in a paper describing how experiential knowledge was central to developing the ENRICH peer support intervention [ 32 ]. Our research questions here are based on the Context and Facilitation domains of the framework, with context referring largely to the NHS Trust in which implementation took place (question 1), and facilitators being the PWs and PWCs who delivered the peer support (questions 2–4):

How did the culture of organisations, leadership (including issues of access and authority ) and monitoring and feedback impact implementation of peer support?

How did PWs and PWCs feel that their roles were characterised?

How did PWs and PWCs feel they were able to exercise flexibility while remaining consistent in their approach to delivering peer support?

How did experiential knowledge underpin peer support as it was delivered at each site?

Data sources

Peer worker interviews. Thirty-two PWs delivered peer support in the ENRICH trial and were invited to give written informed consent to participate in the research. All 32 consented and were interviewed after 12 months of delivering peer support. Interviews explored how well training prepared them for the role, their experiences of working as a PW, the support they received in the role and their relationship with clinical teams they worked alongside.

Peer worker coordinator interviews. Eight PWCs supervised PWs in the trial. Seven PWCs were themselves experienced PWs and one was a mental health nurse who shared the role with an experienced PW. All 8 PWCs gave informed consent to participate in the research and were interviewed at the same timepoint as PWs. Interviews explored PWCs’ experiences of supporting PWs, how well they thought the role was supported and organisational issues impacting delivery of peer support.

Interviews were conducted by researchers working from a perspective of having experienced mental distress and/ or having used mental health services, and played a key role in schedule development. Interview schedules can be found in the Supplementary Material file.

Data analysis

Interviews were audio-recorded, pseudonymised at the point of collection and transcribed verbatim.

Interview data were analysed using a framework approach [ 33 ] based on the Context and Facilitation domains of the modified PARIHS framework (see Table  1 ). Data were first coded to the constructs within those domains, with inductive space retained to code factors not related to the framework that participants described as impacting delivery of peer support. Second, a comparative, cross-case analysis was used to look for patterns of implementation that were: A, shared across cases; B, characterised high fidelity-high engagement cases; C, characterised low fidelity-low engagement cases; D, described implementation in the outlier case [ 30 ]. Preliminary analyses were undertaken by the first author and refined through iterative rounds of discussion with the whole team.

Characteristics of included cases

The two high engagement-high fidelity cases (sites 3,5), and the outlier high fidelity-low engagement case (site 2), were in urban areas with PWs directly employed in mental health NHS Trusts (see Table  2 ). The two low engagement-low fidelity cases (sites 4,6) were in areas that were a mix of rural localities with small towns or urban localities respectively. In both the latter sites PWs were employed by voluntary sector organisations outside of the NHS.

Characteristics of participants

A total of 20 PWs were included in the analysis, five each from sites 3 and 4, three each from sites 2 and 5, and two from site 6. Twelve PWs were female, seven were male and one preferred not to say. Three PWs were aged under 35 years of age, 12 aged from 35 to 55 years, one over 55 and four preferred not to say. Eleven PWs were White British, two were White Irish, one White other, one Black/ Black British, one Asian/ Asian British, one Arab, one Mixed White Asian with two preferring not to say.

There were five PWCs, one from each site. Four PWCs were female and one was male; two were aged from 35 to 55 and three over 55; all were White British.

Participant quotes presented below are identified with a site code (e.g. S1 = site 1) and role identifier (PW = Peer Worker; PWC = Peer Worker Coordinator) plus an additional number to distinguish between PWs at each site.

Implementation across cases

A number of implementation features were evident across all five cases, including characterisation of the PW role as largely consistent with the principles that were used to inform development of the intervention; [ 27 , 32 ] taking a non-judgemental approach and sharing experiences to create a safe space, make connections and build relationships:

‘We’re not going to be judgemental so to speak. It’s a safe place really for people to be themselves regardless of what their mental health issues are or mental health diagnoses are.’ (S5PW2). ‘I’m always sharing lived experience, whether that’s just generally or whether that’s personally with mental health … obviously you share when appropriate but you try to match that experience together so you have something in common, and then there is that mutuality and reciprocity and creating that trusting relationship.’ (S3PW3).

On the whole, training – as specified in the ENRICH manual – was consistently delivered and worked well to provide PWs with the range of skills they felt they needed for the role:

‘We did a lot about strengths-based approaches and I think that’s really informed the way that I interact with people, so I think I’m always trying to bring it back to what can you do, what is strong for you … we did a lot about active listening and also about discussing difficult issues … I think it’s been very helpful the stuff we did in training … definitely the boundaries and relationships sessions that we did …’ (S3PW1).

The importance of group supervision facilitated by the PWC, as well as individual supervision where required (both specified in the handbook), was indicated across sites, providing the opportunity for PWs to share experiences and receive feedback from one another as well as from the PWC:

‘I will hold these feelings until supervision and that’s when I let it out, offload it to my colleagues. And it’s been great because we’ve been bouncing it off each other and I’ve noticed that it’s not just me that was going through it, so it’s such a relief …’ (S2PW2). ‘… [PWC] will always ask how I am, if anything has triggered me or anything like that and she’s quite easy to talk to and it’s OK to be open with her.’ (S6PW3).

Participants in all sites described differences between the culture of clinical services in the host trust and the ethos underpinning peer support:

‘…it’s about the values because what I find with the other types of support, it all tends to be clinical and deficits based … very directive and judgemental … some of the clinical teams are stuck in that way of seeing things, that deficit-based thing and they don’t really know too much about peer support.’ (S5PW1).

At all sites, there was a perceived lack of contact with, and feedback from, community mental health teams, sometimes accompanied by a lack of understanding of the PW role:

‘Whenever I got a new service user, I’d email their [Community Psychiatric Nurse] or care coordinator … to give them more information about it and nobody, apart from I think one person, got back to me. So that’s been quite challenging, not really having any communication or contact really with the mental health teams that are working with the service users …’ (S5PW3).

Interviewees in all sites remarked that the timing of the offer of peer support - prior to discharge from hospital - was particularly challenging for some, especially in relation to maintaining contact with the PW following discharge. This represented a barrier to engagement that was related to the clinical context, rather than implementation:

‘… they are being introduced to it as soon as they come out … they are going through a tough period of fear, of not knowing what’s next for them. The last thing they want is to commit to 16 weeks of meeting someone that they don’t even know.’ (S2PW2). ‘I suspect that the post-discharge needs more targeting, that would be my sense. There are people who really get so much out of it, but then there are an awful lot who just disengage. It’s another stress for them I think.’ (S4PWC).

Implementation in high fidelity-high engagement cases

There was evidence of features supporting implementation in the high fidelity-engagement cases which contrasted with low fidelity-lowengagement cases (see below). In high fidelity cases, cultural differences between clinical services and peer support were generally seen as an asset and were valued, rather than as a source of tension:

‘… you need a values-based practice and how important it is, as opposed to the clinical based practice and how helpful that is … I’m not saying the clinical approach is wrong or anything like that, what I’m saying is we need to complement each other, we need to take a holistic approach.’ (S5PW1).

Some aspects of organisational culture were seen as supportive of peer support, including the role of recovery colleges in preparing PWs for the role or providing additional training once in post (recovery colleges employ an adult education model to supporting people with their mental health, often co-delivered by people using mental health services [ 34 ]):

‘… we were in a really fortunate position being linked with a Recovery College, that, where later in their work they then wanted to do specific recovery focused training around diagnosis we were able to provide that for people.’ (S3PWC).

In these cases, staff on the wards (inpatient units) were reported as largely familiar with and valuing the role of peer support:

‘… when I’d go on the ward … they seemed to see great value in the transparency of people being there because they’ve got lived experience. That aspect of it was really nice … good for the culture of the organisation in many ways.’ (S5PWC). ‘… the clinical teams are aware … they’re very excited that we’ve got peer workers on the ward. They’re very positive about it.’ (S3PW3).

PWCs described PW recruitment as having followed the process specified in the intervention handbook, and as such the PWs who were appointed were well equipped to deliver the role:

‘… we had the right people to execute these roles effectively really … we had quite a diverse selection panel … we had the right people that expressed the interest I think …’ (S5PWC).

There was evidence that PWs and PWCs – as intervention facilitators - had worked hard in delivering clinical team preparation sessions, as specified in the handbook, offering repeat sessions where necessary, and that this had supported a good relationship with ward teams:

‘… [in] the early days we went in to talk about ENRICH and then if they’d had significant staff turnover, which is really happening a lot … we’d then go back to the teams just so that they were aware of what ENRICH was about, what their role was … it certainly meant that staff were much more welcoming of the ENRICH peer workers when they came onto the wards.’ (S3PWC).

PWCs reported being well resourced in their leadership role, both in terms of having sufficient time to do the work and having sufficient supervision themselves around any difficult issues that might arise:

‘… [my role] was two days a week and that was plenty of time…’ (S3PWC). ‘I have had unconditional support from my manager … it’s been part of my regular monthly supervision … any kind of difficulties I’ve had or frustrations or whatever that has come up, that has been an ideal time to go through it. But I’ve also been supported to discuss things as and when they come up …’ (S5PWC).

In these sites, there was evidence that delivery of peer support was highly consistent with the manual. There was notable emphasis on flexible application of peer support, especially around pacing support in response to the individual’s needs, spending as much time as necessary alongside the participant to build a trusting relationship:

‘… it doesn’t necessarily follow a linear path a lot of the time. Sometimes, somebody might be having a really bad week and they actually want you to listen to what’s been going on for them … at the beginning, because you are getting to know the person as well, I think the kind of conversation you’d have is a bit more general … and then it might actually take a completely different path however many meetings down the line and they’ll actually go … “I haven’t told anyone about a particular issue, but I want to talk it through with you and see what you think”.’ (S3PW1).

PWs at these sites demonstrated confidence in taking a lead from the person they were supporting, consistent with the principles of choice and control that underpinned the intervention:

‘… I’m kind of getting to know things that they’re interested in and this is influencing where I signpost them to … it’s just about giving them the option and then they can make their own decision then whether they want to go, and again that’s putting them back in control, which is all about helping people to recover really and take control back of their lives.’ (S5PW2).

PWs also described learning from the people they were supporting, and the importance of validating their experiences, consistent with the principle of reciprocity in the underpinning framework:

‘There are people who I’m supporting who … realise that the medication is very important to them and that they will probably always be on it. So, I gain insight from that, just because maybe I found that medication in my own lived experience wasn’t particularly fantastic but for others it’s very important. So, you learn from other things … you’ve got to validate their experience because … they know what works for them and you can’t tell somebody else what will work for them …’ (S5PW1).

Implementation in low fidelity-low engagement cases

There was evidence of barriers to implementation in low fidelity-lowengagement cases. In both, PWs were employed in not-for-profit organisations, resulting in organisational context-related barriers to implementation. Resource issues impacted leadership of the intervention with, in one site, the organisation not having capacity to provide cover or suitable supervision for the PWC:

‘… we’ve had different staff line managing me over the past year because of maternity. But to be fair none of them really knew about ENRICH … there was nobody who could have covered my role here … it’s felt like a bit of pressure to continue doing it because I took a bit of time off … I couldn’t physically go out and do anything when I wasn’t well …’ (S6PWC).

Support for PWCs at these sites, including an Action Learning Set with other PWCs, was difficult to access because of lack of sufficient funding to travel to meetings:

‘I think the action learning sets worked really well … maybe they should have been planned for a bit more financially … because ultimately we had to go back to our Trust and say we need to find more money or I’m not going.’ (S4PWC).

Being outside of the NHS also created issues of access and authority for PWCs:

‘I would have thought there should be regular team meetings, but we never seemed to be able to get in on them … an additional disadvantage from being an organisation outside of the Trust …’ (S4PWC). ‘… it’s been difficult with the [NHS Trust], some of the staff there … I don’t want to say too much, but that’s been difficult.’ (S6PWC).

This extended to PWs being able to communicate with clinical teams about the people using:

‘A few times they didn’t want to talk to me because I didn’t have enough information for them … to establish who I was … I just wanted to know whether they were seeing [participant] or whether they’d stopped seeing him, and they wouldn’t tell me.’ (S4PW3).

At these sites there was, generally, a challenging relationship with ward-based clinical staff, potentially impacting on the initial relationship building phase of the peer support:

‘There were certainly, on that site, a lot of suspicious looks and “what on earth is this all about” type conversations. However much we tried to prepare the staff team, and we’d gone in and visited and talked to them all, but there was still that “what’s this all about”? People didn’t get it straight off.’ (S4PWC).

Cultural differences with the host NHS Trust were keenly felt by PWs employed in not-for-profit organisations:

‘… the ward environment is, well obviously it’s clinical. It sometimes feels some staff, but not all staff, who work on the wards are not really sure what my role is or have a vague understanding. There’s perhaps a little bit of a difference in terms of pecking order and me in the pecking order.’ (S6PW2). ‘… they will be looking at the patient’s files … they can build up a judgement before seeing you … when the patient sees the peer support worker they might talk to us because we’re non-judgemental, we don’t feedback unless there is a safeguarding issue or danger to themselves or others … I don’t think peers should be seeing files …’ (S4PW44).

Both sites also combined rural localities with urban areas, with issues of geography hindering timely delivery of peer support at remote hospital sites:

‘… the geography issue was a great challenge in itself in our area because I was one bit of the triangle and the [hospitals] were in two different places … I’d have had an hour or so travelling and then get there and “oh, they’re on leave until 10pm tonight”.’ (S4PWC).

Geography could also impact on building a strong sense of PW team:

‘I did lots of talking to [the PWC] but not so much my fellow peers. There was one fellow peer that I talk quite a lot to … the other two were very close to each other and so they were almost functioning as one … I got on OK with the people at [the other town] … it’s just that we had differences of opinion.’ (S4PW3).

There was some inconsistent delivery of training, with one PW reporting having received a truncated version of the training programme as a result of capacity issues:

‘I didn’t actually do [the full training] … because I was covering a maternity leave it was the girl did all the training. So, I basically had a morning with the coordinator where we went through the whole bumph together … ’ (S6PW3).

While the importance of group supervision was acknowledged in these sites, there was disruption leading to inconsistency with the pattern of weekly group supervision as a result geography in one site, and capacity in the other:

‘We don’t generally do weekly anymore … generally we do monthly although I check in by phone with them.’ (S4PWC). ‘… a lot of the supervision has ended up being one-to-one just because it’s a small team here … sometimes I would be able to meet with them together but often because my day, I’ve only got one a day week, I’d have to fit them in if one of them couldn’t do it that day …’ (S6PWC).

Possibly as a result of disruption to supervision or opportunities to support each other as a team, PWs at these sites at times appeared to lack confidence in delivering peer support:

‘… it made me feel that I was getting it all wrong … she didn’t really talk at all about, and I felt that I couldn’t, I just felt that I had to wait for her to give information to me … because that’s what I understood you are supposed to do, is wait for them to give you information to talk about their problems …’ (S4PW3). ‘… I’m imagining it’s going to be quite hard for a long time because the expression that I’ve used that comes to mind is pulling teeth. It’s going to be probably like that every time we meet … it is frustrating because you want to help them.’ (S6PW2).

Implementation in the outlier high fidelity-low engagement case

The outlier case shared contrasting sets of features with the other cases. Like high fidelity and engagement sites, the outlier case reported feedback from management describing a positive impact of peer support on culture in the NHS trust:

‘… within senior management they’ve seen the power of peer working and they really like it … we’re in discussions on when ENRICH finishes, that we’re going to have a number of peer workers within teams, exactly to try and change the nature and change the culture …’ (S2PWC).

PWs in this site also demonstrated a more confident, patient approach to relationship building:

‘… trying to build that friendly rapport, getting them to trust you, showing them that you understand them in a way … creating that safe space environment for them to be able to talk about how they are feeling or what’s going on for them … just finding out what they want to do for themselves not someone else telling them what to do … ’ (S2PW0).

However, as in the two low fidelity-low engagement cases, in the outlier site barriers to implementation included a challenging relationship with ward staff:

‘… [I feel] looked down upon sometimes, “oh, you’re just a peer support worker” … it’s the environment. The days that I do go for ward meetings are usually the days I need a long break, I’ll be honest with you …’ (S2PW2).

In this site there was also disruption to group supervision, with some PWs needing considerable additional support from the PWC and a challenging team dynamic emerging:

‘I was definitely doing weekly one-to-one supervisions with the peer workers when they first started … it kind of came apparent that it was what people needed … for me it didn’t work very well, I was exhausted … people want one-to-one sessions to talk about colleagues and issues they are having with their colleagues … I think there are two other peer workers who are less, they don’t see themselves as much as part of the team.’ (S2PWC).

The PWC indicated that they would have benefitted from additional support for their role:

‘I feel like we could have done more support around, more training kind of stuff on managing people with lived experience … … maybe one thing would have been more meetings with other peer worker coordinators and just see how other people are doing it … more guidance on what group supervision actually was … ’ (S2PWC).

This study used a qualitative, comparative case study design to explore how implementation of a peer support intervention might be associated with engagement with peer support and, as indicated in results elsewhere, [ 26 ] with outcomes. We noted clear differences related to organisational context between high fidelity-high engagement cases and low fidelity-low engagement cases. Lack of a positive working relationship between PW and ward (inpatient) clinical teams, exacerbated by lack of awareness of the potential role of peer support, is likely to be crucial to engagement where people begin peer support in hospital. Levels of engagement were highest in cases where those relationships were reported as largely positive and where differences in approach (between clinical practice and peer support) were highly valued [ 6 , 35 ].

We note that the two low fidelity-low engagement sites employed PWs in the not-for-profit sector rather than within the NHS. Elsewhere, research has indicated that the principles underpinning peer support might be better maintained within peer-led or not-for-profit organisations, [ 7 ] and that doing so might provide an opportunity to bring a change of culture into statutory services [ 35 ]. However, we observed constraints on resourcing for leadership roles, and lack of access and authority for managers in the not-for-profit sector, compounded, perhaps coincidentally, by the additional challenges of geography. Neither did we observe, in those sites, evidence of leadership for peer support from within the host NHS organisation that might have facilitated better implementation [ 36 ]. In our outlier high fidelity-low engagement case, resourcing for leadership also impacted support for PWs. Proper resourcing for PWCs has been identified elsewhere as crucial to providing good peer support [ 5 , 37 ]. PWCs at sites that struggled with levels of engagement identified the need for a wider network of mutual support beyond their immediate organisation, with work elsewhere highlighting the need to develop communities of practice around lived experience leadership roles in mental health services [ 38 , 39 ]. As such, our findings reinforce the link that has been observed elsewhere between leadership in implementation, and the outcomes of a newly implemented intervention [ 40 ].

At the two high engagement-high fidelity sites, PWCs noted that robust recruitment processes resulted in a PW team that were well equipped to deliver what was a challenging role. An experience of the PW team as mutually supportive, complemented with group supervision led by a PWC bringing experiential knowledge to their role, was identified as important at all five sites included in our analysis, as it is in the wider literature [ 2 , 5 ]. The PW training programme was equally valued across all sites with PWs indicating that it prepared them well for their roles. Again, the importance of training that is specifically tailored to peer support having been widely noted [ 3 , 4 ]. In sites where there were inconsistencies in delivery of supervision and training, this appeared to impact confidence among PWs in offering peer support that reflected the underpinning principles framework. Sites with high fidelity scores were indicative of a clear focus on relationship and trust building, characterised by spending time alongside the individual offered peer support, learning from them, before taking their lead in exploring new possibilities. These values have been identified as fundamental to peer support, [ 41 ] and our own analysis of data from the trial indicated that relationship building at the beginning of the peer support was predictive of ongoing engagement [ 42 ].

It is worth noting here that not all challenges to engaging people with the peer support were attributable to implementation issues. Across sites, interviewees felt that discharge from hospital was a challenging time for some people to consider taking up peer support. Other trials of peer support for discharge have also struggled in this respect, [ 43 ] especially where participants were those with a higher level of need (people with multiple admissions) as they were in our study [ 15 ].

Strengths and limitations

We employed a robust, theoretically informed comparative case study design, with case selection determined by a priori measures of fidelity [ 31 ] and engagement [ 26 ] made independently of this analysis. We analysed a complete data set – interviews of PWs and PWCs – in all sites included in the analysis, although we might usefully have also interviewed NHS clinicians and managers as they also played a role in implementation. Analysis of in-depth interviews exploring the experiences of people offered peer support will be reported elsewhere. Our original interview schedules were not directly informed by the PAHRIS framework [ 22 ] and so may not have elicited a full range of data relating to implementation variables. Other frameworks might have been indicative of different barriers and facilitators of successful implementation. Nevertheless, we note the work adapting the PAHRIS framework to elucidate the role of experiential knowledge in implementation was particularly suited to a study of peer support and informed by lived experience on the research team [ 25 ].

Implications for policy, practice and research

Mental health workforce policy in England, as elsewhere, is encouraging employment of large numbers of PWs into mental health services.[ 44 ]. A range of training programmes have emerged [ 45 ] that, to some degree, share a set of principles similar to those that informed ENRICH. This study suggests that specific supports for PWs need to be properly resourced as integral to the offer of peer support in mental health services. These include supervision from an experienced PW, opportunities for group supervision, and an emphasis on relationship building in PW training that is consistent with a principles-based peer support framework. While it has been suggested that peer support can drive cultural change in mental health provider organisations, [ 46 ] our research suggests that lack of supportive culture can constrain delivery. Peer leadership, provided with sufficient support and authority, is needed to support change work with clinical teams, in hospital and in the community, so that peer support and clinical care are part of a complementary offer.

This study identifies policy and practice implications when peers are employed through not-for-profit organisations to work in partnership with public mental health providers. Research elsewhere highlights the potential challenges and opportunities of this ‘hybrid’ approach, [ 35 , 47 ] indicating a need for strategies that effectively align implementation expectations between the not-for-profit organisation and the mental health provider.

Further research to develop and evaluate the introduction of peer support in mental health might usefully be informed by a change model that incorporates this range of implementation variables to optimise delivery of peer support. We also note that in our study, PWs were employed to, and supervised within a dedicated PW team that provided peer support across several clinical teams, while in many mental health services internationally PWs are employed as embedded members of multi-disciplinary clinical teams. There is a need for research that considers the implications for implementation and outcome of these contrasting organisational configurations.

This study provides clear indication that implementation issues can impact delivery of peer support, with implications for engagement and, potentially, outcomes. Resourcing can impact consistency of delivery, alongside challenges of access, authority and relationship with clinical teams, especially where PWs are employed outside of the mental health service. Attention needs to be paid to the impact of geography on implementation.

Data availability

The datasets used and analysed during the current study are available from the corresponding author on reasonable request.

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This study was funded by the UK National Institute for Health Research (NIHR), Programme Grants for Applied Research funding programme (grant number RP-PG-1212-20019). This paper presents independent research funded by NIHR. The views expressed are those of the authors and not necessarily those of the UK National Health Service (NHS), the NIHR or the Department of Health and Social Care.

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Steve Gillard, Rhiannon Foster & Anthony Salla

St George’s, University of London, London, UK

Sarah White

East London NHS Foundation Trust, London, UK

Rahul Bhattacharya, Paul Binfield & Daniella Harnett

South London & Maudsley NHS Foundation Trust, London, UK

Rachel Eborall

Kingston University, Kingston, UK

Sarah L Gibson

King’s College London, London, UK

Alan Simpson

University of Huddersfield, Huddersfield, UK

Mike Lucock

Kingston Hospital, Kingston, UK

Jacqueline Marks

Implementing Recovery through Organisational Change, Nottingham, UK

Julie Repper

South West London & St George’s Mental Health NHS Trust, London, UK

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SG, SW, SLG, AlS, ML, JR, MR and JW contributed to the conception of the original study. SG, RF, SW, RB, PB, RE, DH, AlS and AnS contributed to the design of the work reported here. SG, RF, SW, RB, RE, AlS, ML, JR, MR and JW contributed to interpretation of the data. SG, RF, SW and JM contributed to the acquisition and analysis of data. SG, RF and SW drafted and substantively revised the work. All authors approved the submitted version of the study.

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Correspondence to Steve Gillard .

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Gillard, S., Foster, R., White, S. et al. Implementing peer support into practice in mental health services: a qualitative comparative case study. BMC Health Serv Res 24 , 1050 (2024). https://doi.org/10.1186/s12913-024-11447-5

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47 case interview examples (from McKinsey, BCG, Bain, etc.)

One of the best ways to prepare for   case interviews  at firms like McKinsey, BCG, or Bain, is by studying case interview examples. 

There are a lot of free sample cases out there, but it's really hard to know where to start. So in this article, we have listed all the best free case examples available, in one place.

The below list of resources includes interactive case interview samples provided by consulting firms, video case interview demonstrations, case books, and materials developed by the team here at IGotAnOffer. Let's continue to the list.

• McKinsey examples
• BCG examples
• Bain examples
• Deloitte examples
• Other firms' examples
• Case books from consulting clubs
• Case interview preparation

Click here to practise 1-on-1 with MBB ex-interviewers

1. mckinsey case interview examples.

• Beautify case interview (McKinsey website)
• Diconsa case interview (McKinsey website)
• Electro-light case interview (McKinsey website)
• GlobaPharm case interview (McKinsey website)
• National Education case interview (McKinsey website)
• Talbot Trucks case interview (McKinsey website)
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• McKinsey case interview guide (by IGotAnOffer)
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• McKinsey live case interview extract (by IGotAnOffer) - See below

2. BCG case interview examples

• Foods Inc and GenCo case samples  (BCG website)
• Chateau Boomerang written case interview  (BCG website)
• BCG case interview guide (by IGotAnOffer)
• Written cases guide (by IGotAnOffer)
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• BCG mock case interview with ex-BCG associate director - Public sector case (by IGotAnOffer)
• BCG mock case interview: Revenue problem case (by IGotAnOffer) - See below

3. Bain case interview examples

• CoffeeCo practice case (Bain website)
• FashionCo practice case (Bain website)
• Associate Consultant mock interview video (Bain website)
• Consultant mock interview video (Bain website)
• Written case interview tips (Bain website)
• Bain case interview guide   (by IGotAnOffer)
• Digital transformation case with ex-Bain consultant
• Bain case mock interview with ex-Bain manager (below)

4. Deloitte case interview examples

• Engagement Strategy practice case (Deloitte website)
• Recreation Unlimited practice case (Deloitte website)
• Strategic Vision practice case (Deloitte website)
• Retail Strategy practice case  (Deloitte website)
• Finance Strategy practice case  (Deloitte website)
• Talent Management practice case (Deloitte website)
• Enterprise Resource Management practice case (Deloitte website)
• Footloose written case  (by Deloitte)
• Deloitte case interview guide (by IGotAnOffer)

5. Accenture case interview examples

• Case interview workbook (by Accenture)
• Accenture case interview guide (by IGotAnOffer)

6. OC&C case interview examples

• Leisure Club case example (by OC&C)
• Imported Spirits case example (by OC&C)

7. Oliver Wyman case interview examples

• Wumbleworld case sample (Oliver Wyman website)
• Aqualine case sample (Oliver Wyman website)
• Oliver Wyman case interview guide (by IGotAnOffer)

8. A.T. Kearney case interview examples

• Promotion planning case question (A.T. Kearney website)
• Consulting case book and examples (by A.T. Kearney)
• AT Kearney case interview guide (by IGotAnOffer)

9. Strategy& / PWC case interview examples

• Presentation overview with sample questions (by Strategy& / PWC)
• Strategy& / PWC case interview guide (by IGotAnOffer)

10. L.E.K. Consulting case interview examples

• Case interview example video walkthrough   (L.E.K. website)
• Market sizing case example video walkthrough  (L.E.K. website)

11. Roland Berger case interview examples

• Transit oriented development case webinar part 1  (Roland Berger website)
• Transit oriented development case webinar part 2   (Roland Berger website)
• 3D printed hip implants case webinar part 1   (Roland Berger website)
• 3D printed hip implants case webinar part 2   (Roland Berger website)
• Roland Berger case interview guide   (by IGotAnOffer)

12. Capital One case interview examples

• Case interview example video walkthrough  (Capital One website)
• Capital One case interview guide (by IGotAnOffer)

12. EY Parthenon case interview examples

• Candidate-led case example with feedback (by IGotAnOffer)

14. Consulting clubs case interview examples

• Berkeley case book (2006)
• Columbia case book (2006)
• Darden case book (2012)
• Darden case book (2018)
• Duke case book (2010)
• Duke case book (2014)
• ESADE case book (2011)
• Goizueta case book (2006)
• Illinois case book (2015)
• LBS case book (2006)
• MIT case book (2001)
• Notre Dame case book (2017)
• Ross case book (2010)
• Wharton case book (2010)

Practice with experts

Using case interview examples is a key part of your interview preparation, but it isn’t enough.

At some point you’ll want to practise with friends or family who can give some useful feedback. However, if you really want the best possible preparation for your case interview, you'll also want to work with ex-consultants who have experience running interviews at McKinsey, Bain, BCG, etc.

If you know anyone who fits that description, fantastic! But for most of us, it's tough to find the right connections to make this happen. And it might also be difficult to practice multiple hours with that person unless you know them really well.

Here's the good news. We've already made the connections for you. We’ve created a coaching service where you can do mock case interviews 1-on-1 with ex-interviewers from MBB firms . Start scheduling sessions today!

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Authorities in Georgia have released video recordings of their 2023 interview with a teen who is now suspected high school shooter, and his father.

Colt Gray, the 14-year-old who authorities accuse of killing four people in a shooting last week at Apalachee High School in Barrow County, and his father Colin, answered questions from Sheriff's deputies in May of 2023. Authorities were following up on reports from an FBI tip line that someone had posted messages threatening to commit a school shooting.

The FBI said the boy denied making the threats and his father said his son didn't have "unsupervised" access to hunting guns in the house.

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The Jackson County Sheriff's Office also said nothing had justified bringing charges against either Gray or his father in 2023.

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I’m not sure this week could get much worse for Cleveland Browns quarterback Deshaun Watson.

After playing abysmally in the humiliating loss to the Dallas Cowboys, Watson has now been named in another lawsuit. A new victim, stemming from a date in 2020 while he was a member of the Houston Texans, has accused Watson of sexual assault.

Sparing the details of the accusation here, Pro Football Talk’s Mike Florio outlines the newest lawsuit in his breaking article .

His time in Cleveland has already looked like it is coming to an end based on the product the Browns have gotten on the field. Now his exit may just be expedited as the legal process continues to unfold here. And it may just warrant a suspension as Yahoo! Sports’ Charles Robinson believes the NFL will look at this lawsuit differently than the already-resolved suspension from 2022.

If Watson is indeed suspended, all of his guarantees would be voided on his contract and the Browns would be able to cut bait without penalty.

Read all the best Browns coverage at the Akron Beacon Journal and Browns Wire .

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Meeka Hossain and Jeffrey Klein’s Creative Los Angeles Wedding Blended Bengali and Jewish Traditions

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Content creator Meeka Hossain and talent manager Jeffrey Klein had their meet-cute in Barneys’ shoe department in Beverly Hills during the summer of 2018. “Our first date went so well that it ended up lasting nearly 24 hours,” says Meeka. Three and a half years later, on New Year’s Day, the couple would take the next step in their relationship. “After an early breakfast on the Malibu pier, we went for a hike in the Santa Monica Mountains,” remembers Meeka. “When Jeff felt we were far enough into our hike, he paused in the middle of a secluded canyon to propose. He wanted the moment to be just for us—without any photographers—so we could own that memory completely.”

One special touch of the engagement? Meeka’s sister, jewelry designer Stella Simona of Haati Chai , designed the ring together with Jeff. “I hadn’t seen my engagement ring before the proposal, nor did I give any hints about what I wanted,” says Meeka. “Jeff wanted a design with a vintage feel inspired by my heritage, and Stella nailed it, bringing his vision to life.”

The couple admits that wedding planning was “more stressful than we ever imagined.” After touring venues in Mexico and India, as well as interviewing 10 wedding planners, neither felt a connection to their potential options. “Ultimately, our real-estate agent—who also found us our house—suggested the stunning Paramour Estate ,” says Meeka. With a date available six months away, Jeff and Meeka would need to quickly start planning to achieve a wedding that blended both their style and cultures.

“I decided to take it on myself and teamed up with my friend  Misha Sumitra , the events and marketing manager at Saie ,” Meeka says. “Neither of us had planned a wedding before, but I love and trust her expertise and creativity. Every idea I brought to her was met with a resource or a solution. Together, we came up with outrageous ideas like transforming the valet parking lot at the Paramour into our dinner setup. Despite having hosted so many weddings, we were told that ours achieved a lot of ‘firsts’ for the venue.”

As planning kicked into high gear, Meeka and Jeff began looking for a wardrobe befitting the scale of their wedding celebrations. The first night would take place at a Case Study House in Silver Lake with the couple’s family and wedding party. The rehearsal dinner also doubled as a birthday party for Jeff, who wore a Sandro suit and Bottega Veneta slippers for the event. Meeka decided to wear a custom two-piece set by  Wiederhoeft  from  Loho Bride that night. “I fell in love with the corset details and intricate hand-beading done in India, which made it perfect for my fusion wedding,” she shares. “I added length to the skirt and designed a tulle neck scarf inspired by a traditional Indian dupatta.”

For the ceremony, Meeka chose a classic strapless Vera Wang gown. “Funny enough, the first wedding dress I tried on was it ,” she says. “I decided on Vera Wang and never looked back. I knew I wanted something timeless and with a long train. The drop waist and simplicity of the dress gave it a slightly edgy, understated feel that perfectly matched my personal style, while the veil added that delicate touch to tie the whole look together.” She paired the ensemble with Jimmy Choo heels and pearl studs for a minimalist touch. Jeff wore a suit by his favorite designer, Alexander McQueen , to say his vows. Meeka adds, “A sheer  Acne Studios shirt provided a soft contrast, and he accessorized with heirloom pieces—his grandfather’s gold pocket watch and gold diamond ring.”

As a nod to Meeka’s heritage, both the bride and groom wore custom Sabyasachi at the reception. “After meeting the designer in New York, I knew I wanted to be a Sabya bride, so we traveled to India for the perfect piece,” shares Meeka. “My red lehenga, from the Heritage collection, honored my culture and paid tribute to the women of Calcutta, where my mother is from.” She also wore a gold choker with rubies, emeralds, and pearls; a pearl and emerald nose ring; and bangles by the designer to complete the ensemble. As a sentimental touch, the bride re-created her mother’s wedding-day henna design on her hands and feet. For his look, Jeff wore a cream sherwani with a gold kurta underneath and slippers he purchased from a street vendor in Jaipur. “He accessorized with a custom  Haati Chai  earring, inspired by our family vacation at an elephant sanctuary in Jaipur. The hint of red in his earring, combined with his McQueen suit, hinted at the vibrant colors that would be revealed later in the night,” says Meeka.

The wedding party looks were thoughtfully curated as well, with the bridesmaids in saris and the groomsmen in kurtas. “The girls brought in the vibrant colors, while the guys balanced it out with neutrals,” shares the bride. “I personally selected each sari during my trip to India in March, choosing different jewel tones to complement my red lehenga.” Meeka called on her friend designer  Sam Adair to create the sari tops. “My sister and I gathered inspiration from our favorite Bollywood movies, which Sam brought to life with beautiful sketches,” she says.

On August 9, Jeff and Meeka, along with their bridesmaids and groomsmen, checked into the storied Chateau Marmont to celebrate the wedding all weekend long. The rehearsal dinner at the Case Study House owned by the couple’s friend Gina Correll also doubled as their own take on a Gaye holud. “In Bengali culture, the holud is one of the key prewedding rituals, where everyone wears yellow and orange and you put turmeric on the bride and groom,” explains Meeka. “So even without a full holud ceremony, I had my bridesmaids wear yellow to celebrate my culture.”

When the wedding day arrived, Meeka and her bridal party spent the morning getting ready together. “ Chanel  exclusively handled my wedding-day makeup, with artist  Kate Lee  creating my looks,” says the bride. “After a trial with Kate, I instantly loved her natural, soft glam approach. For my Vera Wang look, I aimed to look like myself, just enhanced.” Hairstylist Nicolas Flores created a sleek, slicked-back bun she would wear the entire evening. The couple decided to do a first look and took portraits in a vintage Mercedes.

Guests gathered on the grounds of the Paramour Estate before the ceremony began. The band Freedom Fry , who is managed by Jeff, played a few songs for the crowd before the procession began. “For our ceremony, we stayed away from the traditional arch or chuppah, and instead used soft, airy botanicals from the ground up, creating a more grounded feel with the garden and our surroundings,” shares Meeka of the scene. “Jeff described the ceremony as déjà vu because it was exactly what we envisioned from the start. From the sitar player composing our walk-down-the-aisle song to the canvas-draped benches filled with our closest friends and family, everything felt perfect as we exchanged our vows.” The couple also nodded to both their heritages in the ceremony. “We included a variation of the Indian ‘ring game,’” says the bride. “We filled a large bowl with uncooked rice and Jeff’s ring, and whoever found the ring first would be the ruler of the household—naturally, I won! To conclude the ceremony, we followed Jewish tradition by breaking a glass to symbolize our life together and everything that lies ahead.”

After the cocktail hour, the guests made their way to the dinner reception. “Our table was custom-built in the shape of a crescent moon. After the Jewish prayers over challah and wine, we shared a meal of traditional Bengali cuisine,” says Meeka. “We personalized each guest’s place setting with custom curry tins, and their seating assignments were revealed through a spice market–inspired display. After dinner, guests could fill their tins with spices to take home.”

The fun was far from over after the party headed indoors. Meeka and Jeff changed into their Sabyasachi looks and made a grand entrance through marigold garlands curated by floral designer Albasa . Then the newlyweds performed a fully choreographed, five-minute Bollywood routine featuring their wedding party. “The entire routine felt like a scene from a Bollywood film,” recalls the bride. “Both Jeff and I had solos, and my sister joined me to end the performance with a hit song from the Bollywood movie  Devdas . After our performance, we invited all the guests to join us on the dance floor. We had brought Indian slippers from Jaipur for guests to dance in once they got tired of their heels.” The couple even arranged for special Macallan cocktails, a speakeasy room, and a dessert installation that featured a mix of Bengali and Jewish sweets by  Sophie Dalah . While the guests eventually needed to leave the venue, the party continued late into the night back at Chateau Marmont.

Reflecting on the day, the bride shares she feels both happy and relieved. “Despite all the planning, there are always things beyond your control on the wedding day. It’s important to go with the flow and embrace the imperfections,” she says. “Looking at the photos brings back all the best memories and makes it all worth it!”

Ever since we started dating, Jeff and I have been exploring Case Study Houses, so it felt perfect to welcome our closest friends and family to a Schindler house for our rehearsal dinner.

I actually didn’t pick this Wiederhoeft set at first, but Loho Bride thought I might like it. Once I tried on that corset and knew the hand-beading was done in India, I was set on it.

I wore a custom Wiederhoeft two-piece set to our rehearsal dinner and designed a tulle neck scarf inspired by a traditional Indian dupatta. I also wore white satin Jimmy Choo pumps. Jeff put his outfit together the day of and selected a Sandro suit that he paired with Bottega Veneta slippers.

My older sister, Stella, and I are four years apart—just like her two boys, Noah and Liam. This image perfectly captures our sibling dynamic.

The female statue behind me embodied the energy I wanted to channel for the night: angelic, feminine, and bold.