The Consulting Day 0 Cheat Sheet & Formula Card Deck
At 9:10 a.m., a client says, “Our margins are down, competitors are cheaper, and the board wants an answer by Friday.” The consultant who survives is not the one with the fanciest framework - it is the one who can turn noise into a clean problem, do the right math, and say what to do next.
- Start with the exact decision. Never solve “profits are falling” before asking: by how much, since when, in which business, and against what target?
- Use a driver tree, not a framework dump. Break the problem into MECE branches: revenue, cost, capital, customer, competition, or operations depending on the case.
- Prioritise before analysing. State the 2-3 branches most likely to matter and explain why.
- Know your formulas cold. Profit = Revenue - Cost; Revenue = Price x Volume; Contribution = Price - Variable Cost; Break-even Units = Fixed Cost / Contribution per Unit.
- Convert math into a business insight. “Margin fell by 4 points” is data; “raw material inflation explains most of the decline, so pricing or sourcing must change” is consulting.
- End with a recommendation plus risks. Say what to do, why, expected impact, implementation steps, and what could go wrong.
- The best Day 0 answers are simple, numbered, and spoken like a consultant: “I would first clarify the objective, then build a driver tree, then test the highest-impact branch.”
Big Picture
Consulting Day 0 prep is not about memorising 40 frameworks. It is about building one reliable operating system: clarify the decision, structure the problem, run the right math, and communicate a practical recommendation.
The Core Consulting Operating System
Use this five-step sequence in almost every case - profitability, growth, market entry, pricing, operations, due diligence, and turnaround. The topic changes; the thinking rhythm does not.
If you feel weak at the first step, revise defining the problem before solving it. Many candidates lose the case before the first calculation because they structure the wrong question.
The Formula Card Deck: What You Must Know Cold
These are not finance formulas for an exam. These are conversational tools. In a case, say the formula, plug in numbers cleanly, then translate the result into a business implication.
For deeper practice on the most common profitability math, revise contribution margin and break-even analysis in cases.
Worked Example: Break-even in 90 Seconds
Case prompt: A food brand is considering a delivery-only kitchen. Fixed cost is ₹6,00,000 per month. Average order value is ₹400. Variable cost per order, including ingredients, packaging, and delivery-linked cost, is ₹250. Should the brand proceed if it expects 5,000 orders per month?
The consulting answer is not “profit is ₹1,50,000.” The answer is: “Proceed only if demand above 4,000 orders is reliable; otherwise negotiate fixed cost, improve order value, or reduce variable cost before launch.”
The Three Frameworks You Actually Need on Day 0
Frameworks are useful only when they reveal drivers. Do not say “I will use 4Ps” unless the problem is truly about product, price, place, and promotion. Use these three flexible structures first.
1. Profitability Driver Tree
When profit falls, split profit into revenue and cost. Then split revenue into price and volume, and cost into fixed and variable cost. This is the cleanest starting point for most cases.
2. Market Entry Logic
For market entry, answer two questions: is the market attractive, and can we win? Then choose how to enter. If you need a fuller version, revise entry modes such as organic entry, partnership, joint venture or acquisition.
3. Prioritisation Matrix
Consultants rarely analyse every branch equally. They prioritise based on impact and ease of validation. This is how you avoid boiling the ocean.
Definitions You Should Be Able to Say in One Breath
- Case interview: A business problem-solving conversation where the candidate structures ambiguity, analyses data, and recommends action.
- MECE: A grouping principle where branches are mutually exclusive and collectively exhaustive.
- Issue tree: A visual breakdown of a problem into smaller drivers that can be tested independently.
- Hypothesis: A testable early answer that guides analysis without becoming a fixed conclusion.
- Unit economics: Revenue, cost, and profit measured per customer, order, product, or transaction.
- Synthesis: The act of converting facts and calculations into a clear business implication.
Zomato and Blinkit: The Portfolio Logic Behind a Consulting Answer
Zomato’s food delivery and quick commerce story is a useful Indian example of how consultants separate today’s profit engine from tomorrow’s growth option.
Situation: Zomato began as a food delivery and restaurant discovery business, while quick commerce emerged as a separate adjacency with different order frequency, delivery network requirements, inventory logic, and customer behaviour. Zomato discusses food delivery, quick commerce and other businesses separately in its investor disclosures (Zomato Investor Relations).
The strategic move: Instead of treating the company as one blended P&L, a consultant would separate it into business units: food delivery as a more mature engine, quick commerce as a high-growth option, and newer adjacencies as portfolio bets. The analysis would ask three questions: does the core generate improving economics, does the adjacency share capabilities, and can the company fund growth without losing discipline?
The lesson: A shallow candidate says, “Quick commerce is growing, so it is good.” A consulting-ready candidate says, “The decision depends on segment-level contribution margin, order density, dark-store productivity, repeat behaviour, and whether shared customer data and delivery capabilities create an advantage.”
So what: The case proves the Day 0 principle: separate the problem into drivers before forming an opinion. Growth is not automatically value creation; it becomes attractive only when the economics and capability fit support the strategy.
How AI Changes the Consulting Day 0 Cheat Sheet
AI does not remove consulting fundamentals. It raises the bar. If everyone can generate a generic market-entry framework in seconds, your edge becomes sharper problem framing, better assumptions, cleaner synthesis, and judgment under ambiguity.
Practical workflow: Load this cheat sheet, your resume, and one target company’s annual report into NotebookLM. Ask it to generate five likely consulting interview cases, then practise one aloud and compare your answer against the five-step operating system. For a dedicated practice routine, use AI as a mock consulting interviewer.
Interview Relevance
“A consumer goods company has seen profits decline for two years despite stable revenue. How would you diagnose the issue?”
In cost cases, never recommend blanket cuts immediately. Separate waste from growth-enabling spend. If you need a sharper structure, revise recommending cost reduction without killing growth.
Common Mistake
The mistake: jumping to a memorised framework before defining the exact business problem. It costs candidates because the interviewer hears a generic answer, not problem solving. One-line fix: always start with, “Before I structure, I want to confirm the objective, scope, time period, and success metric.”