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Best resources for McKinsey case interviews & PEI

Justin asked on Jul 01, 2019 - 2 answers

Hello everyone,

Just wanting to know everyones thoughts on the best preparation materials for McKinsey case interviews/ PEI.


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replied on Jul 02, 2019
McKinsey/Actionable feedback/Harvard University/Warwick Business School
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Hi Justin,

PEI section.
Prepare the stories for each of the sections listed below. Make sure you use top-down approach, where you tell the result first. Be proactive and make sure your stories are worth listening, use body language and eye contact.
Record yourself in a web-cam and look through the recording to see how you can improve.

Please see below a non-exhaustive, but already quite comprehensive, list of potential questions

Entrepreneurial drive

  1. What was a situation where you set a major goal and been able to achieve it?
  2. Tell me about a time when you achieved a difficult goal
  3. What has been your major accomplishment so far?
  4. Tell me about a time that you did something innovative


  1. Give me three examples of a time that you lead a group.
  2. What are some key lessons you have learned about motivating people? 

  3. Tell me about a time you lead a team through a conflict
  4. Tell me about a time you lead a team to achieve a difficult goal
  5. Tell me about a time where you were leading a team and you needed to force someone to work when they didn't want to do it

Personal impact

  1. Tell me about a time that you persuaded your boss to go along with an idea you had
  2. Tell me about a time that you managed upwards
  3. Tell me about a time that you changed someone's mind
  4. Tell me about a difficult situation where you had to rely on your communication skills
  5. Tell me about a time where you dealt with a conflict/crisis/difficult member in your team

Case Interview

Structure your preparation into 2 main blocks: theory and practice

Ist stage. Theory

  • Wharton casebook 2010- you can check how all industries work there (airlines,

    retail etc)

  • Case-in-point – you can check what frameworks exist, try to practice and learn

    them (product launch, M&A etc.)

  • Check how former business consultant approaches different cases with best

    interviewers – listen to at least 3 cases of LOMS

  • Check out MECE principle, top-down, bottom-up à pyramid principle (book

    Barbara’s Minto Pyramid) IInd stage.


  • Create your own case schedule (solve at least 1 case per day) with partners in local groups, universities/preplounge (extreme case)

  • Structure everything you do (how to go the shop, structure articles you read)

  • Solve at least 1 case per each case type you found in case in point

  • Learn how to analyze graphs (practice looking at graphs and asking so whats out of them)

  • Brainstorming is a must = generate at least 10 ideas on an topic in 30 seconds

I am sure you will make it. You should remember that it is not about the talent, but a practice.

Link to a fulll guide:

Pls text me if access is not granted automatically.

Kind regards,

replied on Jul 17, 2019
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Hi Justin,

I wrote a blog post here some time ago on that subject:

For your convenience, please find it also copied here:

  • "Case in Point" book by Marc Cosentino
  • "Case Interview Secrets" book by Victor Cheng
  • Victor Cheng youtube videos
  • Case books from the well-know us universities which you can find here:
  • Of course - needless to say - PrepLounge
  • "The Ultimate McKinsey PEI Prep" eBook which I put together to efficiently prepare my coaching candidates for McKinsey PEI questions, which you can find here:
  • Recently I have added a blog with free expert advice on the McKinsey PEI where I am sharing some answers on the most common PEI questions that I receive from coaching candidates and which are worth sharing:
  • Once you start feeling comfortable with solving cases in general, focus on being as structured as possible in every sentence you say and every answer you give ("ABS - always be structured"). This is especially important for McKinsey, as they are most picky when it comes to being structure in case interviews. For this, I wrote a distinct book with the most important frameworks and business concepts for case interviews (you can find it here: Case Interview Frameworks - This book not only gives you a short description and basic idea of the frameworks and concepts, but also a step-by-step guide on how to actually use and implement them (you would be surprised how many candidates don't have a clue about that!).

Edit: For McKinsey case interview practice, there is also a McKinsey case compilation available online (

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