The job, and the small simulation of it
What consultants do, and how a case interview is a short version of that work.
Key takeaways
- A case interview is a short simulation of a consultant's job. The interviewer plays the client with a problem.
- Understanding the problem and making one clean first split beats reciting a memorized list of checklists that does not fit the problem.
- Firms use this format because it is a sample of the real work.
We start with no assumptions. A management consultant is someone a company hires for a few weeks or months to help with a hard business problem. Profits may be falling. The company may be thinking about entering a new country. A factory may be running late. The consultant collects the facts, breaks the problem into clear parts, does the numbers, and recommends what to do. At many firms, consultants then help the client put the plan into action.
Key idea
A case interview is a short simulation of a consultant's job. The interviewer plays the client with a problem. You play the consultant. In about 20 to 40 minutes you need to understand the problem, break it down, do some math, read a chart or two, and say what you would do.
Firms use this format because it is a sample of the real work. Anyone can say they are good at solving problems. In a case, you have to show it, live, on a problem you have not seen before. That is why it feels hard at first, and why practice makes such a big difference.
This platform teaches and drills the parts that can be taught: structuring a problem, the math, reading exhibits (the charts and tables you are handed during a case), the common case types, the firm formats and online tests, and the fit interview (the questions about you, your experiences, and why you want the job). It does not promise a job offer. It also does not replace live practice with other people, which still matters a lot. The lesson "How to practice: running cases with a partner" shows you how to do that well.
The two main live formats
In an interviewer-led case, the interviewer drives. They give the prompt, ask you to structure it, then take you through a set of questions, exhibits, and calculations they have prepared. McKinsey, one of the largest consulting firms, is best known for this style. You still think hard, but you follow their path.
In a candidate-led case, you lead. The interviewer gives the prompt and then mostly responds to you. You present your structure, choose where to start, ask for the data you need, and move toward the answer. The interviewer shares exhibits when you ask and helps only when you are stuck. BCG, Bain, and many other firms often use this style. Many real interviews mix the two, so be ready for both.
Some firms and offices also use a written case (you read a pack of data and prepare slides), a group case (several candidates solve a problem together while assessors watch), or an online test before any interview. The recruiting lesson at the end of this foundation explains where each one is common.
Same prompt: "A coffee chain's profits are down. What is going on?"
Weaker answer
The candidate immediately says "I will use the three Cs, the four Ps, and a SWOT" (three well-known business checklists) before understanding the problem.
Stronger answer
The candidate pauses, asks one or two clear questions, then says: "I want to find out whether this is a revenue problem or a cost problem, so I will start by splitting profit into those two and checking which one moved."
Why the stronger answer wins: Understanding the problem and making one clean first split beats reciting a memorized list of checklists that does not fit the problem. This platform trains you to give the stronger kind of answer.
In a candidate-led case, who decides where to start the analysis?
Sources for this lesson (1)
- Recognized public explanations of case-interview concepts and frameworks
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