Consulting Interview Guide: 7 Case Frameworks You Need to Know

Consulting firms charge clients millions of dollars to solve problems no one else can figure out. A retailer’s profits are evaporating. A pharmaceutical company needs to decide whether to acquire a competitor. A tech startup wants to enter a new market but cannot tell if the opportunity is real.

The case interview exists because that is the actual job. Instead of asking you to talk about your strengths, consulting firms hand you a business problem and watch how you think through it in real time. Your ability to structure ambiguity, do math under pressure, and deliver a clear recommendation in 30 minutes is the single best predictor of whether you will succeed on a client engagement.

If you are preparing for interviews at McKinsey, BCG, Bain, Deloitte, or any other strategy firm, this guide covers the seven frameworks you need to internalize, a full practice case walkthrough, and the mindset shifts that separate candidates who get offers from those who do not. For a deep dive on one specific firm, see our McKinsey interview guide.

Interviewer-Led vs. Candidate-Led: Know the Difference

Before you touch a single framework, you need to understand the two case formats because they require different skills.

Interviewer-led (McKinsey style): The interviewer controls the direction of the case. You present your initial structure, but the interviewer then guides you through specific questions, data exhibits, and calculations. You must think on your feet because you cannot predict which branch the interviewer will explore next.

Candidate-led (BCG, Bain, and most Big 4): You drive the entire case. After receiving the prompt, you build your structure, decide which area to investigate first, ask for data, perform analysis, and deliver a recommendation. The interviewer plays the role of the client—they answer your questions but do not steer you.

The practical difference: in an interviewer-led case, you need strong reactive thinking and the ability to pivot quickly. In a candidate-led case, you need the confidence to own the conversation and the organizational skill to keep track of where you have been and where you are going.

Both formats test the same underlying competencies. The frameworks in this guide work for either one.

What Case Interviews Actually Test

Every case interview, regardless of firm or format, evaluates five core skills.

Structured thinking. Can you take a messy, open-ended problem and break it into logical, non-overlapping components? Interviewers are looking for MECE structures (Mutually Exclusive, Collectively Exhaustive) that demonstrate you can organize complexity without missing anything important.

Business judgment. Do your hypotheses and recommendations make sense in the real world? If a company’s revenue is declining, do you instinctively ask about market trends, competitive dynamics, and customer behavior—or do you go down irrelevant rabbit holes?

Quantitative skills. Can you set up calculations correctly, estimate reasonable numbers, and do arithmetic quickly without a calculator? Mental math is not optional. You will be asked to calculate market sizes, profit margins, break-even points, and ROI figures on the spot.

Communication. Can you explain your thinking clearly as you go? Consulting is a client-facing job. If you cannot walk an interviewer through your logic in a structured, easy-to-follow way, you will not be able to do it with a CFO either.

Synthesis. Can you pull your analysis together into a crisp, actionable recommendation? The best candidates do not just present findings—they tell the client what to do, why, and what the risks are.

The 7 Essential Case Frameworks

These seven frameworks cover the vast majority of case interview prompts you will encounter. Learn the underlying logic of each one, not just the labels.

1. Profitability Framework

When to use it: The prompt mentions declining profits, shrinking margins, or a company that is “losing money.” This is the most common case type.

The structure:

Profit = Revenue - Costs

Revenue                          Costs
├── Price per unit               ├── Fixed costs
│   ├── Has pricing changed?     │   ├── Rent, salaries, equipment
│   └── Discounting or mix?      │   └── Any new fixed obligations?
└── Quantity sold                └── Variable costs
    ├── Number of customers          ├── COGS, materials, shipping
    ├── Purchase frequency           └── Have input costs risen?
    └── Market share trends

The key to a profitability case is isolating where the problem actually is before proposing solutions. Is the issue on the revenue side, the cost side, or both? Within revenue, is it price or volume? Within costs, is it fixed or variable? You keep drilling until you find the root cause.

Pro tip: Always ask whether the profitability decline is industry-wide or company-specific. If the whole industry is suffering, the diagnosis is fundamentally different from a situation where only your client is struggling. This single question signals strong business judgment and most candidates skip it.

2. Market Entry Framework

When to use it: The prompt asks “Should we enter market X?” or “Should we expand into country Y?” or “Is this a good opportunity?”

The structure:

Market Entry Decision
├── Market attractiveness
│   ├── Market size and growth rate
│   ├── Profitability of existing players
│   └── Regulatory environment
├── Competitive landscape
│   ├── Number and strength of competitors
│   ├── Barriers to entry
│   └── Customer switching costs
├── Company capability
│   ├── Relevant capabilities and assets
│   ├── Brand recognition in target market
│   └── Financial resources available
└── Entry strategy
    ├── Build (organic growth)
    ├── Buy (acquisition)
    └── Partner (joint venture, licensing)

Pro tip: Candidates routinely analyze the market without assessing whether the company has the right to win in it. A massive, growing market means nothing if the client has no competitive advantage. Always connect market attractiveness back to what makes the client uniquely positioned—or not.

3. M&A / Acquisition Framework

When to use it: The prompt involves acquiring, merging with, or investing in another company.

The structure:

Acquisition Decision
├── Strategic rationale
│   ├── Why this target? Why now?
│   └── How does it fit the corporate strategy?
├── Standalone value of target
│   ├── Revenue, profitability, growth trends
│   └── Customer base, IP, talent
├── Synergies
│   ├── Revenue synergies (cross-sell, new markets)
│   └── Cost synergies (eliminate redundancies)
├── Risks
│   ├── Integration complexity
│   ├── Cultural fit
│   └── Regulatory or antitrust issues
└── Valuation
    ├── Is the price justified?
    └── What is the expected ROI / payback period?

Pro tip: Most M&A cases hinge on synergies. Quantify them. If the interviewer says there are $50M in cost synergies from combining supply chains, ask how realistic that number is, how long it takes to achieve, and what the integration costs are. Skepticism about synergy estimates demonstrates the kind of rigorous thinking partners value.

4. Pricing Framework

When to use it: The prompt asks “How should we price product X?” or “Should we change our pricing strategy?”

The structure:

Pricing Strategy
├── Cost-based pricing
│   ├── What does it cost to produce/deliver?
│   └── What margin do we need?
├── Value-based pricing
│   ├── What is the customer's willingness to pay?
│   ├── What value does the product create for them?
│   └── What alternatives exist?
├── Competitive pricing
│   ├── What do competitors charge?
│   ├── Where do we want to position (premium, parity, discount)?
│   └── How will competitors react to our pricing?
└── Implementation
    ├── Pricing model (subscription, per unit, tiered)
    ├── Segmentation (different prices for different customers)
    └── Rollout plan and risk of customer pushback

Pro tip: Value-based pricing almost always yields the highest profit, and interviewers know this. If you default to cost-plus pricing without considering what the customer is willing to pay, you are leaving money on the table—and the interviewer will notice. Start with the customer’s perspective.

5. Market Sizing Framework

When to use it: The prompt is a standalone estimation question like “How many X are there in Y?” or market sizing is embedded within a larger case.

Two approaches:

Top-down: Start with a large known number and narrow it through assumptions.

Bottom-up: Start with individual units and build up.

Worked example: “How many cups of coffee are sold daily in New York City?”

Using a bottom-up approach:

NYC population: ~8.3 million residents + ~1.5 million commuters = ~10 million people

Segment by coffee consumption:
├── Regular coffee drinkers (60%): 6 million
│   └── Average 1.5 cups/day = 9 million cups
├── Occasional drinkers (20%): 2 million
│   └── Average 0.3 cups/day = 0.6 million cups
└── Non-drinkers (20%): 2 million
    └── 0 cups

Total daily cups: ~9.6 million

Add tourist consumption:
├── ~66 million tourists per year / 365 = ~180,000 tourists/day
└── 50% buy coffee, 1 cup each = ~90,000 cups

Grand total: approximately 9.7 million cups per day
(Round to ~10 million for a clean estimate)

Pro tip: The exact number does not matter. What matters is that your approach is logical, your assumptions are reasonable, and you can explain your reasoning. State each assumption out loud so the interviewer can redirect you if you are off base. Also, always do a quick sanity check at the end—does your number feel right?

6. Growth Strategy Framework

When to use it: The prompt asks “How can we grow revenue by X%?” or “The board wants to double in five years—what should we do?”

The structure:

Growth Strategy
├── Organic growth
│   ├── Increase market share
│   │   ├── Win competitors' customers
│   │   └── Improve retention of existing customers
│   ├── Expand into new markets
│   │   ├── New geographies
│   │   └── New customer segments
│   ├── New products or services
│   │   ├── Adjacent offerings
│   │   └── Innovation / R&D pipeline
│   └── Pricing optimization
│       └── Can we capture more value?
└── Inorganic growth
    ├── Acquisitions
    │   └── Buy a competitor or complementary business
    ├── Partnerships / joint ventures
    │   └── Access new capabilities or markets
    └── Licensing
        └── Monetize IP or technology

Pro tip: When given a specific growth target (like “20% revenue increase”), quantify each lever. If current revenue is $500M and the target is $600M, you need $100M in incremental revenue. Walk through each branch and estimate how much each one could realistically contribute. This turns a qualitative discussion into a concrete action plan and immediately elevates your answer.

7. New Product Launch Framework

When to use it: The prompt asks “Should we launch product X?” or “A client is considering entering a new product category.”

The structure:

New Product Launch
├── Market need
│   ├── Is there unmet demand?
│   ├── What problem does this solve?
│   └── How are customers solving this today?
├── Product-market fit
│   ├── Does our product meet the need better than alternatives?
│   ├── What is our competitive advantage?
│   └── What evidence do we have (research, pilots, MVP data)?
├── Go-to-market strategy
│   ├── Target customer segment
│   ├── Distribution channels
│   ├── Marketing and sales approach
│   └── Pricing (link to pricing framework)
└── Financial viability
    ├── Development cost and timeline
    ├── Revenue projections
    ├── Break-even analysis
    └── Cannibalization risk (does it steal from existing products?)

Pro tip: Cannibalization is the question that separates good candidates from great ones. If a company launches a new product, will it take sales from their existing product line? If so, the net revenue gain is smaller than it appears. Always raise this if relevant—interviewers rarely prompt you, and bringing it up unprompted demonstrates sophisticated business thinking.

Full Practice Case Walkthrough

Here is a complete case from start to finish so you can see how the frameworks operate in practice.

Prompt: “Your client is a national retail chain with 200 stores. Profits have declined 15% over the past two years despite revenue growing 5%. The CEO wants to understand what is happening and what to do about it.”

Step 1: Clarifying Questions (30 seconds)

Before building any structure, ask questions that narrow the problem:

• “What does the retail chain sell?” — Mid-range home furnishings and decor.
• “Is this decline happening across all stores or concentrated in certain regions?” — It is happening across all stores, roughly evenly.
• “Has the competitive landscape changed recently?” — Two large online competitors have gained market share over the same period.
• “Have there been any major operational changes in the past two years?” — The client opened 30 new stores and launched a same-day delivery service.

These answers completely reshape how you approach the case. You now know revenue is growing (so this is a cost problem or a margin problem), the issue is company-wide, competition has intensified, and the client made significant investments recently.

Step 2: Present Your Structure (2 minutes)

“Thank you. Since revenue is growing but profits are declining, the issue is clearly on the cost side or in the margin mix. I would like to investigate three areas:

First, cost structure changes—specifically whether the 30 new stores and the delivery service have added costs faster than the revenue they generate.

Second, revenue quality—whether the revenue growth is coming from lower-margin products or channels, which would explain why more revenue is not translating to more profit.

Third, competitive response costs—whether the company is spending more on promotions, discounts, or price matching to compete with the online players.

I would like to start with cost structure since the new stores and delivery service are the most obvious recent changes. Does that make sense?”

Step 3: Analysis and Math (10-15 minutes)

The interviewer shares that the 30 new stores cost $2M each to open and are generating $1.5M in annual revenue each with a 10% profit margin. The delivery service costs $15M annually and is generating $8M in attributable revenue.

New stores calculation:

• Annual revenue from 30 stores: 30 x $1.5M = $45M
• Annual profit from 30 stores: $45M x 10% = $4.5M
• Annual lease and operating costs not captured in the 10% margin: the interviewer confirms that the $2M opening cost is amortized and fully captured, so the stores generate $4.5M profit. This alone is not the problem.

Delivery service calculation:

• Annual cost: $15M
• Annual revenue: $8M
• Net loss: $7M per year, or $14M over two years

You probe further. The interviewer reveals that the company has also increased promotional spending by $12M annually to compete with online players, and average selling prices have dropped 8% due to price matching.

Promotional spending impact: $12M per year additional cost.

Price decline impact: If total revenue is approximately $600M (estimated from 200 stores), an 8% price decline on the original base means roughly $48M in lost revenue that was replaced by volume growth—but at lower margins.

Now you have the picture: the profit decline is driven by (1) a money-losing delivery service ($14M over two years), (2) increased promotional spending ($24M over two years), and (3) margin compression from price matching.

Step 4: Synthesis and Recommendation (2 minutes)

“Based on my analysis, the 15% profit decline is driven by three factors: the same-day delivery service, which is losing $7M annually; a $12M annual increase in promotional spending to compete with online players; and an 8% decline in average selling prices from price matching.

My recommendation has three parts. First, restructure the delivery service. It is losing nearly $7M per year. The client should either raise delivery fees to cover costs, limit same-day delivery to high-value orders, or partner with a third-party logistics provider to reduce the cost base. Second, shift promotional spending from broad discounts to targeted loyalty programs. This protects margins while still retaining customers. Third, stop competing on price with online players—that is a race the client will lose. Instead, invest in the in-store experience, which is the one advantage physical retail has over e-commerce.

The most immediate lever is the delivery service since it has the clearest path to either profitability or shutdown. I would recommend a 90-day pilot with revised delivery pricing before making a permanent decision.”

The Anti-Framework Advice

Here is the uncomfortable truth about frameworks: the best candidates do not use them the way you expect.

Frameworks are training wheels. They teach you the building blocks of business analysis—revenue vs. costs, market attractiveness vs. capability, organic vs. inorganic growth. But once you have internalized those building blocks, your job in the interview is to build a custom structure tailored to the specific problem, not to recite a textbook framework.

This matters most at McKinsey, where interviewers are explicitly trained to penalize candidates who force-fit generic frameworks onto problems. If your first words after hearing a case are “I am going to use the profitability framework,” you have already signaled that you are following a script rather than thinking.

What top candidates do instead:

• Listen carefully to the prompt and identify what makes this problem unique
• Build a structure from first principles that addresses the specific situation
• Borrow elements from multiple frameworks when the problem calls for it
• Explain why they chose to organize their analysis the way they did

The seven frameworks above are essential to learn because they give you a library of analytical structures. But in the actual interview, recombine them, modify them, and make them your own. The interviewer has seen every textbook framework a thousand times. They have not seen your original thinking applied to their specific problem.

Common Mistakes That Sink Candidates

Memorizing frameworks without understanding the underlying logic. If you can recite “Revenue = Price x Quantity” but cannot explain why you are investigating the revenue side before the cost side in a given case, you will struggle when the interviewer asks “why.”

Not asking clarifying questions. Jumping straight into a framework without understanding the context is the fastest way to build the wrong structure. Take 30 seconds to ask two or three targeted questions. It shows discipline and prevents wasted analysis.

Weak mental math. You will be asked to calculate percentages, multiply large numbers, and estimate figures without a calculator. If you hesitate for 30 seconds on 15% of $800M, it undermines your credibility on everything else. Practice quick calculations daily—there is no shortcut here.

Forgetting to synthesize. Many candidates do solid analysis but then trail off at the end instead of delivering a clear recommendation. The synthesis is the most important part. Always end with “My recommendation is…” followed by what to do, why, and what the key risks are.

Not being hypothesis-driven. A hypothesis-driven approach means forming an early point of view and then testing it with data. Instead of analyzing every branch of your framework equally, start with the most likely explanation and investigate that first. This is how actual consultants work and what interviewers want to see.

For more on behavioral and fit questions that accompany case interviews at every consulting firm, review our guides on behavioral interview questions and the STAR method.

How to Practice Effectively

Consulting interview prep is not passive studying. It is a skill that improves only through deliberate, structured practice.

Phase 1: Solo drills (weeks 1-2). Spend the first two weeks on foundation work. Practice building frameworks from scratch—pick a random business problem and give yourself two minutes to outline a structure on paper. Do 10-15 mental math problems daily (percentages, multiplication, division with large numbers). Read business news and practice identifying the key issues in each story.

Phase 2: Partner practice (weeks 3-6). Find a case partner and practice full cases three to five times per week. Aim to complete at least 30 full cases before your interview. Alternate between giving and receiving cases—being the interviewer teaches you to recognize strong vs. weak structures. Use cases from Victor Cheng’s Case Interview Secrets, the Case in Point book, or firm websites.

Phase 3: Refinement (final 1-2 weeks). Time yourself rigorously. Your initial structure should take no longer than two minutes to present. Record yourself on video and review the playback—you will catch filler words, unclear explanations, and math hesitations that you cannot hear in the moment. Focus your remaining practice on your weakest areas.

Benchmarks to hit before your interview:

• You can build a MECE structure for any business problem in under two minutes
• You can calculate percentages, compound growth, and break-even figures in your head
• You can deliver a 30-second synthesis that a non-expert would understand
• You have completed 30 or more full practice cases with a partner

See our consulting interview prep page for more resources and firm-specific guidance.

Start Practicing With Real-Time Feedback

The hardest part of case interview preparation is getting honest, detailed feedback. Practice partners can tell you whether your answer felt right, but they rarely catch structural gaps, math errors, or communication habits that an actual interviewer would flag.

Practice case interviews with AI-powered feedback. OphyAI’s Interview Coach evaluates your structure, math accuracy, and communication—giving you real-time coaching before your MBB interview. It identifies the specific patterns holding you back, whether that is a tendency to skip clarifying questions, weak synthesis, or structures that are not MECE. Use Interview Copilot for real-time assistance during live consulting interviews.

Start practicing free →