Case Interview
A business problem worked through aloud with an interviewer, usually in 25 to 30 minutes, ending in a recommendation. It simulates a client engagement and is scored on structure, arithmetic, judgement and communication rather than on the conclusion.
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Why Case Interview matters in interviews
The case interview is the one assessment in graduate recruiting that tests a performance skill rather than a body of knowledge, which is why reading about it helps less than candidates expect. Firms use it because it is the nearest safe imitation of the job: an unfamiliar problem, a senior person watching, and a recommendation due before the information is complete.
How it works in practice
A typical case runs 25 to 30 minutes after a behavioural section of similar length. The interviewer states a situation (a supermarket whose profit fell, a manufacturer that must cut cost, a market a client is considering entering) and the candidate is expected to structure the problem, ask for data, do the arithmetic aloud, read any exhibit for its message and finish with a recommendation.
What is scored is rarely the conclusion. Structure is judged on whether the branches are specific to the problem, do not overlap and leave no gap. Arithmetic is judged on speed, on whether the answer is interpreted and on whether a dropped zero is caught. Communication is judged on signposting and on how the candidate takes a challenge mid-case.
The first three minutes and the last two decide most cases: the opening structure sets the interviewer’s impression of how the candidate thinks, and the closing recommendation (answer first, reasons, risk, next step) is the part a client would remember.
What candidates get wrong
- Reciting a framework from a book. Interviewers have heard every one, and a structure that could be pasted onto any company shows that the problem was not understood.
- Practising only alone. A case is a conversation, and the skills of listening, steering and recovering from a wrong turn are only built with a partner.
- Treating the fit half as a warm-up. At firms that run a structured behavioural interview it carries close to half the assessment.
- Leaving market sizing and mental arithmetic until the week before. They fail independently of case structure and improve with daily separate drills.
Case Interview: frequently asked questions
What is a case interview?
A business problem worked through aloud with an interviewer, usually in 25 to 30 minutes, ending in a recommendation. It simulates a client engagement and is scored on structure, arithmetic, judgement and communication rather than on whether the conclusion matches the interviewer’s.
How long does it take to prepare for case interviews?
Six to eight weeks of real work is the usual figure, most of it live practice with a partner. Twenty to thirty cases is enough to become comfortable, with returns falling sharply beyond about fifty. Market sizing and mental arithmetic need their own daily drills.
Do I need a business degree for case interviews?
No. Firms hire humanities students, scientists, engineers and lawyers, because the interview tests structured thinking and communication, and any subject can supply the evidence of both.
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