Management Consultant interview questions

A problem statement defines the decision, objective, scope, and deadline.

• It names the business outcome, such as restoring a retailer's profit margin.
• It sets boundaries, such as one country, one product line, and the next 12 months.
• It gives the team one question that the analysis must answer.

A useful problem statement is decision-oriented, measurable, bounded, and neutral about the solution.

• Asking how to raise margin from 8% to 12% is more useful than asking how to improve performance.
• A time horizon and business unit prevent the analysis from expanding without limit.
• Neutral wording avoids assuming that a favored action is already correct.

An issue tree breaks the main problem into smaller questions that can be analyzed separately.

• Each branch narrows the problem, such as splitting profit into revenue and cost.
• The leaves should be concrete enough to link to data, an owner, or an analysis.
• The branches should collectively resolve the original problem.

MECE means categories are mutually exclusive and collectively exhaustive.

• Mutually exclusive branches do not double-count the same item.
• Collectively exhaustive branches cover all material parts of the problem.
• The goal is practical completeness, not a list of every theoretical possibility.

I check whether each fact or driver can belong to only one branch under the stated definitions.

• Clear labels matter because categories such as large customers and enterprise customers may overlap.
• I test several real examples and decide where each one belongs.
• If an example fits two branches, I redefine the categories or add an allocation rule.

I reconcile the branches to a known whole and look for a residual category.

• Revenue branches should add to total revenue, while cost branches should add to total cost.
• An other bucket can expose missing items, but a large bucket means the structure needs refinement.
• I also check whether every material driver in the source data has a home.

A hypothesis is a provisional, testable explanation or answer that directs analysis.

• It should predict something observable, such as margin decline being driven by input-cost inflation.
• Evidence must be able to disprove it.
• It identifies the minimum data needed instead of encouraging collection of everything available.

A fact is supported by evidence, an assumption is accepted for calculation, and a hypothesis is tested as a possible explanation.

• Sales fell 10% is a fact if validated records support it.
• Next year's price stays constant is an assumption used in a model.
• Sales fell because customers switched brands is a hypothesis requiring evidence.

Hypothesis-driven problem solving starts with likely answers and tests the most consequential ones first.

• Initial hypotheses come from the problem structure, basic economics, and available context.
• Each hypothesis links to a specific analysis or research question.
• Findings update, reject, or refine the hypotheses as the work progresses.

I prioritize branches by likely impact, uncertainty, and ease of testing.

• A branch with large potential value and weak current evidence deserves early attention.
• Quick analyses that can eliminate major branches are especially valuable.
• Low-impact questions stay behind the few drivers that could change the recommendation.

The 80/20 principle means focusing effort on the few drivers likely to explain most of the outcome.

• A customer-profitability review might start with the largest segments rather than every account.
• A quick cut should identify where deeper analysis could change the decision.
• The principle does not justify skipping quality checks or material exceptions.

I write the formula first, define units, insert numbers, and then calculate.

• A revenue calculation begins as price per unit multiplied by units sold.
• Units must stay consistent, such as dollars per customer times customers per year.
• I estimate the expected magnitude first so an extra zero is easier to catch.

A percentage change is relative to the starting value, while a percentage-point change is the direct difference between rates.

• Moving from 20% to 25% is a 5 percentage-point increase.
• The relative increase is 25% because 5 divided by 20 equals 0.25.
• I state the unit explicitly because confusing the two can materially distort a result.

I use a weighted average when groups contribute different amounts to the combined result.

• A company margin must weight each product's margin by revenue rather than average product margins equally.
• The weights should sum to 100% or to the full underlying volume.
• I verify that the result falls between the smallest and largest group values.

A break-even calculation finds the volume or time at which cumulative benefit equals cumulative cost.

• Break-even units equal fixed cost divided by contribution per unit.
• Contribution per unit is selling price minus variable cost per unit.
• The calculation should state assumptions about price, cost, timing, and capacity.

I start with profit equal to revenue minus cost and split both sides into their main drivers.

• Revenue usually separates into price and volume, with further cuts by product, customer, or channel.
• Cost separates into fixed and variable components or operational cost categories.
• I compare changes over time to locate the branches responsible for the profit movement.

Revenue is usually driven by price, volume, and mix.

• Price is the amount earned per unit after discounts and rebates.
• Volume is the number of units, customers, or transactions sold.
• Mix matters because a shift toward higher-priced products can raise revenue without more total units.

Fixed costs do not change directly with short-term output, while variable costs move with activity volume.

• Office rent is generally fixed within the relevant period and capacity range.
• Packaging or transaction fees usually vary with each unit sold.
• Some costs are mixed or step-fixed, so I state the volume range and time horizon before classifying them.

Contribution margin is revenue minus variable cost and shows what remains to cover fixed costs and profit.

• Per-unit contribution supports break-even and incremental-volume calculations.
• Contribution margin percentage compares products with different prices on a common basis.
• A product can have positive contribution but still be unprofitable after allocated fixed costs.

Top-down market sizing starts with a broad total and narrows it using relevant shares or filters.

• A sizing may begin with population, then apply target-age, income, adoption, and purchase-frequency rates.
• Each filter needs a source or a clearly labeled assumption.
• The method is fast, but broad averages can hide important segment differences.