What is a case interview?
The single most important thing to understand before you practice anything. Read this once and the rest of CaseKit will click into place.
If you’re applying to consulting, you’ll spend most of your interview not answering questions about yourself, but solving a business problem out loud, live, with the interviewer. That exercise is the case interview, and it’s where offers are won and lost. The good news: it’s a learnable skill, not a talent.
The short answer
A case interview is a roleplay. The interviewer hands you a real-ish business problem, and you work it out together: structuring your thinking, doing some math, and landing on a recommendation.
It usually lasts 20–40 minutes. There’s no spec to memorize and rarely one “correct” answer. What’s being watched is how you think, not whether you happen to know the answer.
A simulation of the job
Consultants get dropped into unfamiliar problems and have to make sense of them fast. The case re-creates that, on purpose.
A trivia test
You won’t be quizzed on facts or formulas. Reasonable assumptions, stated out loud, beat memorized answers every time.
Why interviews work this way
A résumé tells a firm where you’ve been. A case shows them how you’ll behave on day one: when a client is in the room, the data is messy, and someone has to bring order to it. That’s what they’re buying.
So the case is deliberately open-ended. The interviewer is less interested in your final number than in the path you took to get there: did you break the problem into clean pieces, ask for the right information, do the math without panicking, and say what you’d actually do about it? Get comfortable with that and the format stops being scary.
A useful reframe
- You’re not a student being graded. You’re a colleague thinking through a problem with the interviewer.
- Silence is fine; thinking out loud is better. They can only grade what they hear.
- Being wrong and adjusting is normal. Rigid and wrong is the trap.
Anatomy of a case
Almost every case moves through the same four phases. Learn this rhythm and any case (airline, retailer, hospital) feels familiar.
Clarify
Repeat the problem back and ask a few sharp questions. Make sure you’re solving the right thing before you dive in.
Structure
Lay out a framework: the buckets you’ll work through. This is your roadmap, and the interviewer’s first real read on you.
Analyze
Dig into the buckets. Ask for data, do the math, and read any charts the interviewer hands you. Follow where the numbers lead.
Recommend
Pull it together into a clear, confident answer: what you’d do, why, and what you’d watch out for. Lead with the headline.
“Our client is a regional airline. They’ve been losing about $40M a year for two years straight. The CEO wants to know why, and what to do about it. Where would you start?”
What you’re graded on
Interviewers score six things. None of them is “did you get the right number.” Internalize these and you’ll always know what to optimize for.
Structure
Can you break a messy problem into clean, non-overlapping pieces and explain your roadmap before diving in?
Quantitative skill
Comfort with mental math and estimation. Not speed, but accuracy, and the ability to narrate what you're calculating and why.
Communication
Clear, concise, top-down. Can you say the headline first and walk someone through your logic without rambling?
Business judgment
Do your instincts make sense in the real world? Does your recommendation sound like something a company would actually do?
Poise under pressure
Staying composed when you're stuck or challenged. Adjusting gracefully when the interviewer pushes back on your thinking.
Curiosity
The instinct to ask "why" and probe one layer deeper. Interviewers notice when you genuinely want to crack the problem.
Types of cases you’ll meet
Most cases fall into a handful of recurring shapes. You don’t memorize a script for each. You learn a flexible framework, then adapt. Here’s the map; each links to a full guide.
Profitability
"Profits are falling. Why?" The most common case of all. Decompose revenue and cost to find the leak.
Most common02Market entry
"Should our client enter this market?" Weigh attractiveness, fit, and the economics of making the move.
Strategy03Market sizing
"How many ___ are sold in the US each year?" Estimation from first principles, no Google allowed.
Estimation04Growth strategy
"How do we grow revenue 20%?" Find and prioritize the levers: new products, segments, or geographies.
Strategy05M&A
"Should our client acquire this company?" Test the strategic logic, the synergies, and the price.
Advanced→See all frameworks
Browse every framework with worked examples, interactive builders, practice prompts, and quizzes.
Full libraryMyths, busted
Myth: "There's one right answer and I have to find it."
Almost never. Two strong candidates can reach different recommendations and both pass, because the reasoning is what's graded. Defend your logic; don't hunt for a hidden "correct" number.
Myth: "I need to memorize a framework for every case type."
Memorized frameworks are easy to spot and easy to break. Interviewers reward a structure you build for this problem. Learn the patterns, then adapt them live. That's the whole skill.
Myth: "You either have it or you don't."
Case performance is almost entirely trainable. Structure, mental math, and crisp communication all improve with reps, which is exactly what the rest of CaseKit is for.
Talk like a consultant
A few terms you’ll hear constantly. You don’t need to use the jargon, but you should recognize it.
Mutually Exclusive, Collectively Exhaustive. A good structure has no overlapping buckets and no missing ones.
A branching breakdown of a problem into smaller and smaller parts. It is the visual form of a structure.
A factor that moves the outcome. "What's driving the cost increase?" means "which input is responsible?"
An early best guess at the answer that you then test with analysis, rather than exploring blindly.
A quick gut test of whether a number is plausible. "$2 trillion for the US coffee market? Too big. Recheck."
The implication of a finding. Interviewers ask it constantly, so always tie an insight to what it means for the client.
Check yourself
Three quick questions to make sure the core idea landed.