Case Interview Guide - Consulting

Case interviews are a critical part of the consulting recruitment process. They assess your structured thinking, problem-solving ability, and ability to generate insights under pressure. Consulting firms use case interviews to evaluate how you approach complex business problems and communicate recommendations effectively.

This guide covers the common interview formats, key skills assessed, and how to prepare effectively.

📋 Case Interview Formats

Consulting case interviews typically come in two formats:

Interviewer-Led Cases 🎙️

• The interviewer guides the discussion, asking specific questions at each step.

• You’ll be expected to answer concisely and adapt to new information provided.

Candidate-Led Cases 🧑‍💼

• You take the lead in structuring and solving the case, asking for relevant data and making recommendations.

• These are more open-ended and test your ability to break down problems independently.

📚 Key Skills to Master

1. Frameworks for Problem-Solving 🏗️

A strong structure is key to breaking down complex problems. Common consulting frameworks include:

• Market Entry (e.g., competition, customer demand, regulatory environment)

• Profitability (Revenue-Cost breakdown)

• Mergers & Acquisitions (Synergies, integration challenges, valuation)

• Operations Optimisation (Efficiency improvements, cost reductions)

• Growth Strategy (Market expansion, new product launches)

💡 Tip: Avoid rigidly applying frameworks. Customise them to fit the case context.

2. Hypothesis-Driven Thinking 🤔

Consultants solve problems by forming and testing hypotheses.

• Start with a logical hypothesis based on initial case details.

• Use data from the case to validate or refine your hypothesis.

• Be prepared to pivot if new insights contradict your initial assumption.

3. Estimation & Market Sizing 🔢

Interviewers often ask candidates to estimate business metrics.

• Example: "Estimate the number of coffee cups sold in New York daily."

• Break it down using logical assumptions (population, coffee drinkers, cups per day).

💡 Tip: Clearly explain your assumptions and calculations step by step.

4. Brainstorming & Creativity 💡

Clients expect consultants to provide innovative solutions.

• When brainstorming solutions, categorise ideas (e.g., customer-focused vs. operational improvements).

• Prioritise ideas based on feasibility and impact.

5. Quantitative Analysis 📊

Consulting cases require basic math and data interpretation.

• Be comfortable with percentages, ratios, break-even analysis, and growth rates.

• Interpret charts and tables quickly and accurately.

6. Chart & Data Analysis 📈

Consultants work with data visualisations, so be ready to:

• Identify key insights from graphs and tables.

• Compare trends, outliers, and relationships between variables.

💡 Tip: Summarise key takeaways concisely before making a recommendation.

🚀 Tips for Success

Structure First, Then Solve

Always outline your approach before diving into details.

Think Out Loud

Interviewers want to understand your thought process, not just the final answer.

Master Communication

Speak clearly and concisely and communicate insights in a structured way.

Be MECE (Mutually Exclusive, Collectively Exhaustive)

Ensure your breakdown covers all possibilities without overlap.

Be Confident, Not Rigid

Adapt to new data and refine your approach as needed.

Ask Clarifying Questions

If something is unclear, ask. Don’t make assumptions.

📖 How to Prepare

1. Familiarise Yourself with Cases 📚

• Go to the Theory section of GradIQ's Consulting Application Preparation Resources

  • Read Marc Cosentino's Case in Point.

  • Enrol in Crafting Case's free Case Fundamental's course.

    • This course does a fantastic job at introducing students to case interviews.

2. Practice Cases Independently 🧱

• Go to the Case Question section of GradIQ's Consulting Application Preparation Resources.

  • Before practicing with others, work through some case questions independently to familiarise yourself with a broad range of case problems.

    
    

3. Practice Cases with Peers 📝

• Complete mock interviews with peers or mentors.

• Get comfortable leading cases and structuring responses.

👉 Need someone to practice with? Join your university's consulting society or work with an interview coach to refine your skills.

4. Identify Weaknesses and Refine 🔎

• Use feedback from mock interviews to identify areas of weakness

• Strengthen weak areas using recommended case drill exercises found in the Skills section of GradIQ's Consulting Application Preparation Resources.

🏁 Final Thoughts

Case interviews are challenging, but with structured preparation and practice, you can master them. Focus on clear problem-solving, logical thinking, and confident communication. Consulting firms look for candidates who think critically and present solutions clearly and persuasively.