PartnerRoundCase interview frameworks: the 6 you need and how to tailor them
The six case interview frameworks that cover most cases, what each one asks, why reciting them fails, and how to turn any of them into an issue tree built for the client in front of you.
Updated 20 Oct 2026By the PartnerRound team13 min read
TL;DR
- Six case interview frameworks cover most cases: profitability, market entry, growth, M&A, pricing, and operations or cost reduction.
- Each one is a checklist of the questions that matter for that kind of decision, not a script to recite.
- Interviewers mark down generic frameworks. Tailor every branch to the client, the industry and the objective.
- Build the tree in five moves: restate the objective, pick the closest framework, split it MECE, fill it with this client's drivers, then say where you would start.
McKinseyNordwind Airlines: the vanishing marginProfitability · Medium
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Interviewer
Our client is Nordwind Airlines, a short-haul carrier operating out of northern Europe. Over the past three years passenger numbers have grown 18%, but operating profit has fallen by roughly 40%. The CEO wants to understand what is driving this and what to do about it. How would you approach the problem?
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The 6 case interview frameworks at a glance
Case interview frameworks are starting structures for the handful of problems that come up again and again: why profit fell, whether to enter a market, how to grow, whether to buy a company, what to charge, and how to cut cost or fix a process. Learn the six below, then learn to tailor them, because interviewers score the tree you build for this client, not the template you started from. Most cases fit one of the six, or a blend of two.
A framework is simply the list of questions an experienced partner would ask about that kind of decision. Used well, it stops you missing a whole branch. Recited word for word, it tells the interviewer you have memorised rather than thought.
1. Profitability framework
The most common case of all. Profit has fallen, or lags the client's rivals, and the CEO wants to know why and what to do. Profit is revenue minus costs, so split there first, then keep splitting until every branch is something you could measure.
Split revenue by product, customer or channel. Split costs into fixed and variable, then by line.
The order you investigate in matters more than the tree. Find which side moved, then which line, then which segment, then why. Compare against the past and against competitors: a 5% profit fall in a market where everyone fell 15% is a different story from the same fall in a growing market. The questions that crack most profitability cases are short:
- Did revenue fall, did costs rise, or both? By how much each?
- Is the revenue change in price, volume or mix?
- Which cost lines grew faster than volume?
- Is it the client, or the whole industry?
Most profitability cases end with 'which lever should we pull?' The drill below is the kind of quick reasoning that answers it. For the full method, including the profit bridge, see the profitability framework lesson.
Profit & margins drill
ChooseThe question behind half of all profitability recommendations.
Our client, a mattress maker, has a 25% contribution margin. Which raises its operating profit more: a 5% price rise with volume unchanged, or a 5% volume rise at today's prices? Assume fixed costs don't change.
2. Market entry framework
A market entry case is a decision: should we do this? So the structure is the set of conditions that must all hold for the answer to be yes. If any one fails, the answer is no, or yes with a condition attached.
The economics usually come down to one number: the market share the client needs to break even. If that is more than recent entrants have managed, the answer is probably no, or yes only by buying an existing player. The market entry framework lesson covers each branch and the data to ask for.
BainMeridian Coffee enters IndiaMarket Entry · Medium
Meridian Coffee enters India
A candidate-led entry case: size the opportunity, then choose how to enter.
Interviewer
Meridian Coffee operates 410 stores across the United States and has never operated outside North America. The board is considering entering India and has asked us whether they should, and if so, how. Where would you like to start?
3. Growth framework
Growth prompts sound open: 'the client wants to double revenue in five years'. Two moves make them tractable. First, size the gap: if the core business will reach $730m on momentum and the target is $1bn, new initiatives must find $270m, which tells you whether tweaks will do. Second, generate options with a structure, not a free-for-all.
Work from the bottom-left box outwards: selling more of what you already sell to customers you already serve is the cheapest and least risky growth. Before you brainstorm, check for a leak. Flat revenue often hides a retention problem: the client is winning customers as fast as ever and losing them faster. No amount of new-market growth fixes a bucket with a hole in it.
4. M&A framework
Every M&A case asks one question: is the target worth more to us than we would pay for it? Break it into four parts and keep them separate, because they carry different levels of certainty.
- Strategic rationale: why buy at all, and why this target rather than building it ourselves?
- Standalone value: what the target is worth as it is, usually EBITDA × a multiple from comparable deals.
- Synergies: cost synergies are likely; revenue synergies are a hope. Haircut them differently.
- Price and risk: the most we should pay, and what could stop the value arriving: integration, key people, regulation.
The maths usually lands on a multiple: price ÷ EBITDA, before and after synergies. A deal that looks expensive on its own can clear comfortably once credible cost synergies are counted, and a cheap one can fail if the value depends on revenue synergies nobody can guarantee. The M&A case framework lesson works through a full example.
McKinseyAtlas Logistics eyes a last-mile acquisitionM&A · Hard
Atlas Logistics eyes a last-mile acquisition
The multiple looks rich. Separate standalone value from synergies and decide whether the deal clears.
Interviewer
Our client, Atlas Logistics, is a regional freight and warehousing operator. They are considering acquiring Kestrel, a last-mile delivery company, for $340m. Their CFO thinks the price is high. Should they proceed?
5. Pricing framework
Every pricing case rests on three anchors. The cost floor is the price below which each sale loses money. The competitor reference is what customers pay for the nearest alternative. The value ceiling is what the product is worth to the customer. The right price sits between floor and ceiling; where exactly depends on competition, strategy and how much value you want to share.
A quick illustration. A new sensor for factory pumps costs $200 to make, a rival's simpler sensor sells for $600, and ours saves each factory about $2,000 a year in downtime. Floor: $200. Reference: $600. Ceiling: about $2,000 of value a year. At $1,000, the customer earns the price back in six months: an easy sell, and five times the cost.
The most common error is pricing off cost or off the rival alone, which leaves most of the value on the table. The pricing framework lesson covers willingness to pay, elasticity and launch strategy.
6. Operations and cost reduction framework
This framework comes in two flavours. A cost case asks where the money goes: split total cost into lines, compare each with competitors or with the past, and target the biggest gaps first. An operations case asks where a process breaks: map it end to end, work out the capacity of each step, and find the step with the least spare capacity before anyone spends money.
The classic trap is accepting the client's solution. When a client says 'we need a new warehouse', the case is usually asking you to show that a cheaper fix to one step would do. For cost reduction, separate quick wins (procurement, overtime, discretionary spend) from structural changes (footprint, automation, outsourcing), and size each before recommending.
DeloitteVantage Retail's warehouse bottleneckOperations · Medium
Vantage Retail's warehouse bottleneck
An operations case with a real capacity calculation. Find the constraint before you spend the capital.
Interviewer
Vantage Retail runs a single distribution centre serving 180 stores. They are missing delivery windows on about 12% of store orders and are considering a GBP 40m second facility. Is that the right move?
Why memorised frameworks fail
Interviewers have heard the textbook frameworks hundreds of times. A recited structure fails in four predictable ways:
- It is generic. 'Revenue and costs' fits every company on earth, so it shows nothing about this one.
- It misses the real driver. The answer to a case usually sits in something specific: a channel shift, a contract, a capacity limit. Templates rarely name it.
- It does not prioritise. Ten equal boxes give the interviewer no idea where you would start, or why.
- It makes you rigid. Candidates who memorise tend to force the case into the template, even when the data points elsewhere.
Weak
I'll use a market entry framework: the market, the competition, the company and the customers. Then I'll look at the 4Ps: product, price, place and promotion.
Strong
The question is whether a membership makes more profit than pay-per-wash. I'd look at three things. First, who signs up: mostly our regulars, who would pay us less than today, or new customers? Second, the economics: membership revenue against lost wash revenue, and whether extra visits jam the site at peak times. Third, execution: recognising members' cars at the gate, and how rivals respond. I'd start with who signs up, because if most members are existing regulars the idea loses money.
Why: Underneath, the strong answer is still a profitability and pricing structure. But every branch names something specific to car wash memberships, and it ends with a priority and a reason. The weak answer could have been said about any company, which is exactly how it sounds to the interviewer.
How to build a tailored issue tree
- 01RestateThe objective: one metric, one deadline
- 02Pick a backboneThe closest of the six
- 03Split MECENo gaps, no overlaps
- 04TailorThis client's drivers, by name
- 05PrioritiseWhere you'd start, and why
MECE means mutually exclusive and collectively exhaustive: no branch overlaps another, and together they cover everything. Test each level separately. Then replace every generic label with the client's own words: not 'variable costs' but 'delivery cost per order'; not 'customers' but 'school students and their parents'. If you need a refresher on splitting problems cleanly, read issue trees and MECE.
Worked example
Worked example: a pet food maker's falling profit
Prompt: our client makes premium dog and cat food. It sells through supermarkets and, for the past three years, through its own subscription website. Revenue grew from $400m to $460m in two years, but operating profit fell from $40m to $28m. Why, and what should it do?
The generic tree
Profit = revenue - costs; revenue = price × volume; costs = fixed + variable. Correct, and nearly useless: it would fit any company, and it hides the obvious clue. Margin fell from 10% to about 6% while revenue grew, so something about the growth is less profitable.
The tailored tree
Why this is better: it splits by channel because the two channels make money differently. A website order carries delivery and marketing costs that a supermarket sale does not, while supermarket sales carry promotional discounts. Costs both channels share sit in their own branch, so nothing is counted twice.
Hypothesis and first data request
Hypothesis: most of the $60m of growth came from the website, and each website sale earns less once delivery and acquisition costs are counted. First request: revenue and profit by channel, two years ago and today. If the website explains most of the $12m, go down that branch. If not, ingredient costs, which hit both channels, are next.
Which framework when: a comparison
Use this table to choose a starting point from the wording of the prompt, then tailor. The right-hand column is the twist that interviewers most often build into that type of case.
The last row is not a framework so much as a method; our guide to market sizing questions covers it with ten worked examples.
Check yourself
A client says: 'Our main rival just cut prices 15%. Should we match?' Which structure is the best start?
Frequently asked questions
What are the most common case interview frameworks?
Six cover most cases: profitability, market entry, growth, M&A, pricing, and operations or cost reduction. Market sizing comes up often too, but it is a method rather than a framework. Learn the six as checklists, then tailor them to each case.
Should I use a framework in a case interview?
Use one as a starting point, never as the answer. Interviewers want a structure built for the specific client and question, with branches named in the client's terms and a clear place to start. A recited framework is one of the most common reasons candidates are marked down on structure.
What is the difference between a profitability framework and a cost reduction framework?
A profitability framework looks at both sides of profit, revenue and costs, to find what changed. A cost reduction framework assumes the problem is cost and goes deeper on that side: cost by line, benchmarks against competitors, and quick wins against structural changes. Many profitability cases turn into cost cases once you find that revenue held up.
Do I need to know Porter's Five Forces, the 4Ps or the BCG matrix?
Knowing the ideas helps, because they are good checklists for competition, marketing and portfolios. Naming them in the interview rarely helps. Use the thinking in plain words tied to the client, and the interviewer will credit it far more than the label.
How long should I take to structure a case?
Ask for a moment, then take about one to two minutes to draw your tree in silence. Present it in under a minute: the objective, your main branches with one line each, and where you would start. Much longer and you lose momentum; much shorter and the tree is usually generic.
Written by the PartnerRound team
We build case interview practice: an AI interviewer that holds the answer key, guided cases, drills and a free course. Every guide is checked against the cases and drills it links to, so what you read is what you practise. Published 20 Oct 2026.
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