The Case Interview
A structured problem-solving format used by consulting firms to assess analytical and business thinking.
Definition
A case interview is a live business problem-solving exercise in which the interviewer presents a business scenario — such as "A retailer's profits have declined 20% over the last year. What is happening?" — and the candidate walks through a structured analysis. Widely used by McKinsey, BCG, Bain, and increasingly by strategy roles at tech companies, case interviews test hypothesis-driven thinking, quantitative reasoning, and the ability to communicate a structured recommendation under pressure.
Why It Matters in Interviews
Consulting firms collectively hire tens of thousands of analysts and associates each year, and virtually all of them require passing multiple case interview rounds. According to McKinsey's interview guide, performance in the case interview is the primary hiring signal — candidates who pass typically demonstrate structured issue trees, sound estimation, and data-driven conclusions. With strategy and operations roles at companies like Google, Uber, and Stripe also adopting case-style interviews, this skill has broad applicability beyond pure consulting.
How to Use It
Use a structured framework: (1) Clarify the objective and constraints, (2) Structure the problem with a framework (e.g. Profitability = Revenue − Cost), (3) Prioritise your hypotheses, (4) Analyse the data, (5) Synthesise and recommend. Practice with a partner using cases from CaseInterview.com or the Victor Cheng case library. Related reading: Product Sense and Behavioral Interviewing.
Example
"Our client is a supermarket chain. Profits fell 15% last year. Diagnose the issue." — Start by asking: is the decline in revenue, costs, or both? Revenue: are fewer customers coming in, or are they spending less per visit? Costs: are COGS or operating costs increasing? After narrowing to revenue, ask: which product categories are underperforming? If fresh produce margins have dropped, probe supplier cost changes vs. pricing decisions.
Quick Tips
- Structure before you speak — take 60 seconds to write an issue tree before saying anything.
- Think out loud: interviewers evaluate your reasoning process as much as your conclusion.
- Drive the case yourself — don't wait to be led. Ask for data proactively.
- Practise 30+ cases before your first real interview. Case fluency requires repetition.
FAQ
How long is a case interview?
Typically 30–45 minutes. McKinsey and BCG rounds usually include a brief fit/behavioural section (5–10 min) followed by the case (25–35 min).
Do I need to get the "right" answer?
No. Interviewers primarily evaluate your structure, communication, and logic. Reaching a well-reasoned recommendation that happens to be imprecise beats a correct answer with poor structure.
Are case interviews used outside consulting?
Increasingly yes — strategy ops roles at Google, Amazon, and Stripe, as well as growth and bizops roles at startups, frequently include case or analytical components.