Frameworks & Method · 9 min read
Case Interview Frameworks: Profitability, Market Entry, Sizing, Pricing & M&A
The five case types you will actually face — and how to structure each one.
Most case-interview advice tells you to memorize frameworks. That is exactly how candidates fail — they force a generic template onto a specific problem. What strong candidates actually do is build a custom structure from a small set of reusable building blocks. This guide gives you the five most common case types and a clean, adaptable way to structure each, plus the habits interviewers reward across all of them.
The universal case habits (true for every case type)
- •Play back the prompt and ask two or three clarifying questions before structuring — scope, objective, and any constraint.
- •Take 30 to 60 seconds of silence to build a MECE structure. Ask for it explicitly: 'Give me a moment to structure my thinking.'
- •Lead with a hypothesis, not a laundry list. 'My hypothesis is the profit drop is cost-driven; let me test that' beats reciting every possible factor.
- •Do math out loud, round sensibly, and sanity-check the result against reality.
- •Close with a recommendation plus one risk — the 'so what', never a summary of what you did.
1. Profitability (the most common case)
Anchor on the profit equation and break each side down until you isolate the driver. Profit = Revenue − Cost. Revenue = Volume × Price. Cost = Fixed + Variable. Diagnose which branch moved, then go deep only there.
A retailer's profit fell 15% this year. What's driving it?
I'd start by splitting revenue from cost. If revenue is flat but cost rose, I'd break cost into fixed and variable and find the biggest mover — say, logistics up 30% on fuel. Then I'd quantify that line's impact on the 15% and only recommend once I've confirmed it's the dominant driver, rather than guessing at pricing first.
2. Market entry
The question is never just 'can we enter' — it's 'should we, and how'. Assess the market, our ability to win, and the economics, then give a clear go/no-go with conditions.
- •Market attractiveness: size, growth, and profitability of the target market.
- •Ability to win: our capabilities, brand, and cost position vs incumbents.
- •Competition and barriers: who's there, how they'll react, and entry costs.
- •Economics: the investment required and the payback or break-even.
- •Entry mode: build, buy, or partner — pick one and justify it.
3. Market sizing (guesstimates)
Sizing tests structured estimation, not trivia. Choose top-down (start from a population and narrow) or bottom-up (build from a unit and multiply). State every assumption out loud so the interviewer can follow and correct you.
4. Pricing
There are three lenses on price. Name all three, then pick the one that fits the situation.
- •Cost-plus: cost per unit plus a target margin. Simple but ignores willingness to pay.
- •Competitor-based: anchor to substitutes and adjust for differentiation.
- •Value-based: price to the economic value delivered to the customer — usually the right answer for a differentiated product.
5. Mergers & acquisitions
Evaluate the deal on strategic logic first, numbers second, integration risk always. A cheap acquisition that can't be integrated still destroys value.
- •Strategic rationale: does the target close a real gap (capability, market, technology)?
- •Synergies: revenue and cost synergies, discounted for how hard they are to capture.
- •Valuation: is the price justified by standalone value plus realistic synergies?
- •Risks: integration, culture, regulatory, and the single deal-breaker.
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Practice these frameworks in the McKinsey-style Case Simulator with MECE scoring and an annotated debrief.
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