Hypothesis first, and frameworks as vocabulary
Lead with a best guess, change it when the data disagrees, and know the named frameworks as words, never as the structure.
Key takeaways
- Structure tells you where to look. A hypothesis tells you where to look first.
- The stronger answer comes from the maths of this decision and from knowing that heavy goods are costly to move.
- Reciting a framework loses points: Reading a memorized framework out loud as your answer is a known way to fail.
Strong problem solvers do not analyze everything in random order. They lead with a hypothesis: a clear early guess at the answer, made before they have all the facts, which they then test. Instead of "let me look at everything," they say "I think the problem is probably the cost of materials, so let me check that first." If the data agrees, they move fast. If it disagrees, they have learned something and they change the guess.
How to form and use a hypothesis
- 1Form it from the prompt and common sense: "Fuel prices rose last year, so I suspect cost."
- 2Say it out loud, with the reason, after you present your structure.
- 3Say what data would prove it wrong: "If fuel cost per seat is flat, my guess is wrong."
- 4Update calmly when the data disagrees: "The data does not support that. Cost is flat, so I will move to the revenue side."
Key idea
Structure tells you where to look. A hypothesis tells you where to look first. Together they make you fast and focused.
Named frameworks: words to know, not structures to use
You will hear the names of well-known frameworks: the profit tree (profit splits into revenue and cost), the three Cs (customers, company, competitors), the four Ps (product, price, place, promotion), the value chain, Porter's five forces. Know what each name means, so you follow along if an interviewer uses one. Do not reach for one as your structure. Your structure comes from the maths of the goal in this question, as in the lesson "Crack any case in five moves".
Reading a memorized framework out loud as your answer is a known way to fail. It could be pasted onto any prompt, so it says nothing about this one, and it breaks on unusual cases. Write the maths of the goal, then use what you know about the business to choose where to look first. Ideas such as "customers, competitors, company" will come up on their own, as questions about this business.
Prompt: "Should a gym chain launch a home-equipment line?"
Weaker answer
Says out loud: "I will use the three Cs. Customer. Company. Competitor. Then the four Ps. Product, price, place, promotion." It is generic and does not touch the actual decision.
Stronger answer
Starts from the goal: "The launch is worth it if the profit it makes over a few years beats what it costs to start. That profit is units sold x margin per unit, minus the cost to build the line. So I will look at three things: how many members and others would buy, whether this gym brand can win those buyers, and whether the margin survives the costs to make and ship heavy equipment. Shipping is a big cost for heavy goods, so I suspect the money is the hard part. Let me start there."
Why the stronger answer wins: The stronger answer comes from the maths of this decision and from knowing that heavy goods are costly to move. A list of frameworks could be pasted onto any prompt, so it tells the interviewer nothing about your thinking.
Your hypothesis was "costs rose", but the data shows costs are flat. What do you do?
An interviewer mentions "the three Cs". What is the right way to treat it?
Sources for this lesson (1)
- Recognized public explanations of case-interview concepts and terms
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Next module: Case math and quantitative reasoning
That is the end of How to structure any problem. Case math and quantitative reasoning is next in the course.
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