Case Study Job Interview Sample

by Katharine Hansen, Ph.D.

If you’re a business-school student — at the undergraduate or MBA level — chances are you already know something about how to handle a very specialized kind of job interview — the case interview. Many business-school courses revolve around case analysis, and many business students have become pros at picking business cases apart. Still, the thought of doing so within a tight time-frame (usually 15-20 minutes) in the already highly pressured situation of a job interview can be daunting — if not downright terrifying.

The case interview is employed primarily by management-consulting firms, as well as investment-banking companies, and is increasingly being used by other types of corporations as at least part of the job-interviewing process. Some firms use case interviews only for MBA-level job candidates, while others use them for undergraduates, as well.

Business students who are not totally comfortable with case analysis and liberal-arts students with little or no exposure to the case method can take comfort in knowing that a vast collection of resources is available, both on and off the Internet, to tell you everything you need to know to succeed in a case interview. We’d be foolish to try to reinvent any of that great resource material, so the purpose of this article is to give you a brief overview of the case-interview process. We then provide a sampling of excellent resources to help you delve further into this tricky interviewing mode. Perhaps most helpful are the resources provided by companies who actually conduct case interviews. There’s nothing like going to the source when you want to know what your interview will be like.

To invoke a definition of the case interview offered by MIT’s Careers Handbook, it’s an interview in which “you are introduced to a business dilemma facing a particular company. You are asked to analyze the situation, identify key business issues, and discuss how you would address the problems involved.”

Case interviews are designed to scrutinize the skills that are especially important in management consulting and related fields:

  • quantitative skills,
  • analytical skills,
  • problem-solving ability,
  • communications skills,
  • creativity,
  • flexibility,
  • the ability to think quickly under pressure,
  • listening skills,
  • business acumen,
  • keen insight,
  • interpersonal skills,
  • the ability to synthesize findings,
  • professional demeanor,
  • and powers of persuasion.

Above all, the firm will be looking for someone who can do the real work at hand. Management-consulting companies, for example, want to know that you are the kind of person who can make a good impression on clients. Describing a presentation on case interviewing given at Columbia University by representatives of McKinsey and Company, Jim Oh notes that consulting firms value case interviews because “there is no right background for consulting. Consulting requires working in unfamiliar territories, thinking on your feet, and performing in situations where you never have enough time.”

Experts agree on many of the fine points for approaching case interviews:

  1. Practice extensively before undergoing a case interview.
  2. Use books and Web sites in our resources section for practice cases. Some companies that use case interviews provide good information on their own Websites. Boston Consulting Group, for example, provides an interactive case you can work through for practice, as well as additional cases you can rehearse with friends. suggests starting out by practicing explaining something like how to change a tire. Move on to assessing a situation for friends or family members, such as which bank they should choose for a checking account. In all cases, try to avoid “um’s” and other filler words. Practice summarizing in a minute or less, advises

    Boston Consulting Group notes that Harvard Business School produces numerous case studies that can be used for practice; the studies are likely available in your business-school or career-services library or online in academic library databases. Other experts suggest talking to alumni from your school or others who’ve been through a case interview, as well as reading business magazines and periodicals such as the Wall Street Journal to get a sense of how companies deal with the kinds of issues likely to be asked about in case interviews. Some universities offer case-interview workshops.

  3. Listen carefully to the question.
  4. Paraphrase it back to the interviewer to ensure your understanding. As puts it in its article on case interviewing, “Listening is the most important skill a consultant has. The case isn’t about you or the consultant; it’s about the client.” You may also want to take notes; in most cases the interviewer will allow you to do so. suggests bringing not only a pad of paper but a pad of graph paper in case you want to create a graph as part of your conclusion.

  5. Silence — but not too much of it — is golden.
  6. The interviewer expects you to take a minute or so to collect your thoughts, so don’t be afraid of silence. It’s a nice idea, however, to ask the interviewer if it’s OK to take a moment to ponder the case. And don’t take too much time. Experts agree that five minutes would be excessive.

  7. Remember that rarely is there one “right” answer for analyzing a case.
  8. Your process for reaching your conclusions is equally important to the interviewer as is the conclusion itself. In fact, the interviewer wants to observe as much of that process as possible, so it’s important — once you’ve taken the time to gather your thoughts — to “think out loud” as you’re working through the case. Although there is probably not one right answer, the McKinsey representative who spoke at Columbia warns against “wrong approaches,” including “ignoring or forgetting important facts, defending impossible ideas, and force-fitting the wrong structure onto a problem.”

  9. Don’t be afraid to ask questions.
  10. The case interview is meant to be interactive, with lots of back and forth between you and the interviewer. Questions are expected, especially because the information provided about the case will likely be incomplete. The interviewer will be looking at your resourcefulness in collecting information. Make sure you ask your questions in a logical — not random — progression. notes that it’s helpful to adopt “the persona of an actual consultant trying to learn about the assignment” and warns that failing to ask questions is a fatal error in the case interview. Be sure, also, to listen carefully to the answers to your questions. And don’t get rattled if the interviewer wants to know why you want the information you’re asking for. It’s all part of understanding your thought process.

  11. Construct a logical framework with which to explore the critical issues of the case.
  12. Many of the principles you learned in business school can serve as a framework. Examples include Porter’s Five Forces, the SWOT analysis, Value Chain Analysis, and the Four P’s of marketing. If you have some business experience, you can can also draw on applicable situations you’ve encountered. Make sure your conclusion is grounded in action, not just theory. Be able to explain and defend your reasoning.

  13. Prioritize the issues and objectives.
  14. Don’t get bogged down trying to deal with every aspect of the case. As you ask questions, you should be able to pick up clues as to which issues are most important. Some of those clues might be meant to lead you back on track if you’ve gone astray, so be sure to listen carefully. If direction is not forthcoming, don’t be afraid to take control of the conversation, advises, to get to the meat of the case.

  15. Don’t be afraid to think outside the box.

Creativity and brainstorming may be just what the interviewer is looking for.

Some of the standard advice about case interviews is the same advice that applies to any kind of interview:

  • Maintain eye contact. Eye contact will help you engage the interviewer, establish rapport, and contribute to the interactivity of the interview.
  • Project confidence. Your ability to work the case confidently, without getting flustered or frustrated, is key.
  • Demonstrate your enthusiasm. Behaving as though you feel it’s fun to tackle this kind of problem is integral to showing how well you’d fit in as a consultant or whatever position you’re interviewing for. Assure your interviewer though your enthusiastic demeanor that you are exactly the kind of person he or she would enjoy working with.

Types of case interview questions:

  • Calculation/estimation/guesstimate/numerical/market sizing case
  • Problem case
  • Probing case
  • Business operations case
  • Business strategy case
  • Resume case (case based on a company at which you worked)
  • Brainteaser/logical puzzle/IQ question

Find out more about these types of case questions and how to prepare for case interviews using our collection of case interview resources.Get a feel for what a case interview is like — and what can go wrong — in a true anecdote about a case interview gone bad.

And finally, if you need help landing the case interview with a standout resume, turn to our resume templates to get off to the right start.

Katharine Hansen, Ph.D., creative director and associate publisher of Quintessential Careers, is an educator, author, and blogger who provides content for Quintessential Careers, edits QuintZine, an electronic newsletter for jobseekers, and blogs about storytelling in the job search at A Storied Career. Katharine, who earned her PhD in organizational behavior from Union Institute & University, Cincinnati, OH, is author of Dynamic Cover Letters for New Graduates and A Foot in the Door: Networking Your Way into the Hidden Job Market (both published by Ten Speed Press), as well as Top Notch Executive Resumes (Career Press); and with Randall S. Hansen, Ph.D., Dynamic Cover Letters, Write Your Way to a Higher GPA (Ten Speed), and The Complete Idiot’s Guide to Study Skills (Alpha).

Here's a list of Case Interview Questions that I've received as a candidate. Keep in mind the interview format (especially for McKinsey) has evolved since the time I went through it as a candidate.

  • How much time does it take to relocated an average size mountain 10 miles using an average size dump truck? - McKinsey Case
  • Your client is a $300 million a year copper mining company. This year it has lost $50 million. How do you turn it around? - Oliver Wyman Case
  • How many gallons of gasoline does an average gas station in America sell on an average day? - Oliver Wyman Case
  • Your client is a ski resort. Global warming has made it such that natural snowfall has been reduced by 50%. They client is concerned. What should they do and why? - McKinsey Case
  • Your client is a gas station and the market is so competitive that they make no money on gasoline sales. All the profit is in convenience store sales. What is the profit maximizing way to layout the convenience store and why? - McKinsey Case
  • Your client is Motorola. The year is 1980. They just invented the cellular phone 3 years ago. They want you to estimate the market demand for cell phones over the next 30 years and tell them if there is a market for this invention (and prove it) - Bain Case
  • Volvo claims it is the safest car in the world because fewer people die in a Volvo than in a car made by any other manufacturer in the world. What's wrong with this conclusion? - McKinsey Case
  • Your nephew runs a lemonade stand. Yesterday was Monday and he was open from 2pm - 5pm, and sold 2 cups. What should he do differently tomorrow? - McKinsey Case

While many of the sample case questions are from the McKinsey interview, the are equally applicable for a bcg interview or bain interview. In prior years, the interview format across the top 3 firms were much more similar. These days, the various firms have diverged somewhat.

McKinsey is using assessment testing like the McKinsey Problem Solving Test combined with a interviewer-led case study interview format.

Bain is using some written cases (instead of purely verbal ones) in some countries in later rounds.

BCG has recently been experimenting with an assessment test as a pre-1st round step.

Most other firms continue to use the traditional open-ended candidate led case interview format.
You might also want to look at this case interview sample.

Additional Resources

If you found this post useful, I suggest becoming a registered member (it's free) to get access to the materials I used to pass 60 out of 61 case interviews, land 7 job offers, and end up working at McKinsey.

Members get access to 6 hours of video tutorials on case interviews, the actual frameworks I used to pass my interviews, and over 500 articles on case interviews.

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Nov 7, 2010

Tagged as:estimate future demand, estimation question, forecast demand, industry specific metrics, mckinsey case interview, mckinsey problem solving test

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