How to prepare a written case interview?

Hi Anonymous,

I would recommend you to focus on 5 areas to crack a presentation/written case; I have reported them below with some suggestions on how to prepare for each of them

1. Learn how to define a plan of action and stick to that

The first thing you should do in a written case is to define a plan and allocate in the best possible way your time. Assuming 60 minutes for the analysis, a good approach would include:

• initial quick reading – 5-10 min
• structure the approach – 5 min
• make slides/answer to the questions adding detailed analysis and math – 35-40 min
• final review – 10 min

You should then practice to stick to the time allocated, in order to maximize your final performance.

2. Practice graph interpretation

You will normally have to analyse graphs in a written case. The best way to practice is to take graphs from online resources and use a timer to test in how much time you can understand the key message. McKinsey PST graphs could be a good practice for that.

3. Work on quick reading and quick understanding of key information

You will not have time to read and prioritize everything, so you have to understand where to focus. The ideal way to practice is to use long cases such as HBS ones, and practice on reducing the time needed to absorb the key information that can answer a defined question. Quick reading techniques could also help.

4. Practice quick math

You will normally have math to do in a written case. GMAT and McKinsey PST math should work well to prepare on this.

5. Learn how to communicate your slides/answers

You may have to present your findings at the end of the case. I would apply the same structures of final sum up in a live interview case, that is:

1. Sum up the main questions you have to answer
2. Present your proposed answer and detail the motivation behind
3. Propose next steps for the areas you have not covered

As you will not be able to double check hypothesis with the interviewer as in the live case before the presentation, it could make sense to clearly state when you are making hypotheses and that you will have to verify them with further analysis.

When you have to prepare slides, quoting a previous answer I would also recommend to work on

A) structure the order of the slides

Normally the structure for a 5-slide presentation is the following:

• First slide sums up the question and provides the answer
• Second, third and fourth slide have the supporting arguments for the first slide
• Fifth slide has the next steps

B) structure the content of each slide

There are three basic components for slides:

1. Title
2. Chart or data
3. Label for chart

Many people structure the title as the mere description of what the chart is telling. A great title, instead tells the implication of the graph. Eg say the graph is showing a cost structure for a division. A bad title would be: Cost structure from 2005 to 2015. A good title would be: Cost structure of Division XYZ is not sustainable”. A great title would be Cost structure of Division XYZ is not sustainable due to ABC, assuming you have insides on the cause. The rule of thumb for the title is that if you read all the titles of the slides together you should get a clear idea of what is going on.

C) present the slides

When you present, I would suggest the following steps for each slide:

1. Introduce the slide: “Let’s move to slide 2, which will show us why we have an issue with this division”
2. Present the main message of the slide: “As you can see, we have a cost structure which makes for us not feasible to be competitive in this market”
3. Provide details: “The graph, indeed, shows how our fix cost is XYZ, while competitors can benefit from economies of scale. Indeed…”

Hope this helps,

Francesco

Hi June,

as for a previous post I wrote, I would recommend you to focus on 5 areas to crack a written case; I have reported them below with some suggestions on how to prepare for each of them.

1. Learn how to define a plan of action and stick to that

The first thing you should do in a written case is to define a plan and allocate in the best possible way your time. Assuming 60 minutes for the analysis, a good approach would include:

• initial quick reading – 5-10 min
• structure the approach – 5 min
• make slides/answer to the questions adding detailed analysis and math – 35-40 min
• final review – 10 min

You should then practice to stick to the time allocated, in order to maximize your final performance.

2. Practice graph interpretation

You will normally have to analyse graphs in a written case. The best way to practice is to take graphs from online resources and use a timer to test in how much time you can understand the key message. McKinsey PST graphs could be a good practice for that.

3. Work on quick reading and quick understanding of key information

You will not have time to read and prioritize everything, so you have to understand where to focus. The ideal way to practice is to use long cases such as HBS ones, and practice on reducing the time needed to absorb the key information that can answer a defined question. Quick reading techniques could also help.

4. Practice quick math

You will normally have math to do in a written case. GMAT and McKinsey PST math should work well to prepare on this.

5. Learn how to communicate your slides/answers (if required)

You may have to present your findings at the end of the case. I would apply the same structures of final sum up in a live interview case, that is:

1. Sum up the main questions you have to answer
2. Present your proposed answer and detail the motivation behind
3. Propose next steps for the areas you have not covered

As you will not be able to double check hypothesis with the interviewer as in the live case before the presentation, it could make sense to clearly state when you are making hypotheses and that you will have to verify them with further analysis.

Riccardo and Norah also provided some information at the link below, specifically for presentation interviews:

https://www.preplounge.com/en/consulting-forum/presentation-interview-case-702

If you want to provide some more information on the specific written case interesting for you, we may bring some additional feedback.

Hope this helps,

Francesco

(edited)

To answer June's comment to the previous post, this is what I found could improve quick reading. Besides that, there are multiple other elements one could consider; however, in my experience the following are those that can cover 80% of the improvement:

1. Start with the end in mind. Don’t just think about absorbing everything you are going to read (this is normally impossible). Rather, spend some time to identify what are the key questions and which information you have to look for. This will allow you to skim through the text till when you identify an answer to those questions.
2. Be mentally focused. It is very easy to read something and get distracted by other thoughts. Once you have define the target information to identify and the allocation of time you want to dedicate to skimming the case, just focus 100% on the reading. Don’t rethink what you are doing, or you will find yourself reading far slower at the end. The Pomodoro technique works great to train on this point, also for tasks different from reading.
3. Use a ruler/finger to push you to a certain speed level. This will force you to maintain a certain speed constantly, thus increasing your overall speed.
4. Highlight/take notes of relevant parts. Once you have identified the part with the key information, be sure to highlight the relevant areas, so that if you have to use it later you don’t have to lose time looking for such information again.

Best,

Francesco

Hi Anonymous,

as for a previous answer I provided on written tests, this is what I would suggest you to focus on:

1. Learn how to define a plan of action and stick to that

The first thing you should do in a written case is to define a plan and allocate in the best possible way your time. Assuming 60 minutes for the analysis, a good approach would include:

• initial quick reading – 5-10 min
• structure the approach – 5 min
• make slides/answer to the questions adding detailed analysis and math – 35-40 min
• final review – 10 min

You should then practice to stick to the time allocated, in order to maximize your final performance.

2. Practice graph interpretation

You will normally have to analyse graphs in a written case. The best way to practice is to take graphs from online resources and use a timer to test in how much time you can understand the key message. McKinsey PST graphs could be a good practice for that.

3. Work on quick reading and quick understanding of key information

You will not have time to read and prioritize everything, so you have to understand where to focus. The ideal way to practice is to use long cases such as HBS ones, and practice on reducing the time needed to absorb the key information that can answer a defined question. Quick reading techniques could also help.

4. Practice quick math

You will normally have math to do in a written case. GMAT and McKinsey PST math should work well to prepare on this.

5. Learn how to communicate your slides/answers

You may have to present your findings at the end of the case. I would apply the same structures of final sum up in a live interview case, that is:

1. Sum up the main questions you have to answer
2. Present your proposed answer and detail the motivation behind
3. Propose next steps for the areas you have not covered

As you will not be able to double check hypothesis with the interviewer as in the live case before the presentation, it could make sense to clearly state when you are making hypotheses and that you will have to verify them with further analysis.

Riccardo and Norah also provided some information at the link below, specifically for presentation interviews:

https://www.preplounge.com/en/consulting-forum/presentation-interview-case-702

For more information on quick reading you can check the second post at the following link:

https://www.preplounge.com/en/consulting-forum/written-case-712

Hope this helps,

Francesco

(edited)

Hi Justin,

It depends on the material they will send you. Usually, the key areas to prepare are the following.

1. Learn how to define a plan of action and stick to that

The first thing you should do in a written case is to define a plan and allocate in the best possible way your time.

Assuming 15 minutes for the analysis, a good approach would include:

• initial quick reading – 2-3 min (this may depend on the amount of material)
• structure the approach – 1-2 min
• make slides/answer to the questions adding detailed analysis and math – 10-12 min
• final review – 1-2 min

You should practice to stick to the time allocated to maximize your final performance.

2. Practice graph interpretation

You may have to analyse graphs as part of the data provided. The best way to practice is to take graphs from online sources and use a timer to test in how much time you can understand the key message. McKinsey PST graphs are good practice for that.

3. Work on quick reading and quick understanding of key information

You won’t have time to read and prioritize everything, therefore you have to understand where to focus. The ideal way to practice is to use long cases such as HBS ones. You should then learn to absorb the key information of the case. Quick reading techniques could also help.

4. Practice quick math

You will probably have some math to do as part of the data analysis. GMAT and McKinsey PST math should work well to prepare on this.

5. Learn how to communicate your slides/answers

When you have to present your findings in the second part, I would suggest the same structure used for a conclusion in a live interview, that is:

1. Summarize the main questions you have to answer
2. Present your proposed answer and detail the motivation behind
3. Propose next steps for the areas you have not covered

As you will not be able to double-check hypotheses with the interviewer while you prepare the presentation, you should clearly state when you are making hypotheses and that you will have to verify them with further analysis.

If you have to prepare slides I would also recommend to work on:

A) structure the order of the slides

Normally the structure for a 5-slide presentation is the following:

• First slide summarizes the question and provides the answer
• Second, third and fourth slide have the supporting arguments for the first slide
• Fifth slide has the next steps

B) structure the content of each slide

There are three basic components for slides:

1. Title
2. Chart or data
3. Label for chart

Many people structure the title as the mere description of what the chart is about.

A great title instead shows the implication of the graph as well.

Example: say the graph is showing a cost structure for a division.

• A bad title would be: Cost structure from 2005 to 2015.
• A good title would be: Cost structure of Division XYZ is not sustainable”.
• A great title would be Cost structure of Division XYZ is not sustainable due to ABC, assuming you have insides on the cause.

The rule of thumb for the title is that if you read all the titles of the slides together you should get a clear idea of what is going on.

C) present the slides

When you present, I would suggest the following steps for each slide:

1. Introduce the slide: “Let’s move to slide 2, which will show us why we have an issue with this division”
2. Present the main message of the slide: “As you can see, we have a cost structure which makes unfeasible to be competitive in this market”
3. Provide details: “The graph, indeed, shows how our fix cost is XYZ, while competitors can benefit from economies of scale. Indeed…”

In terms of how to prepare, I do a session exactly on that.

Before the session, I can send you the data source to work on. We can then simulate the panel during the class, reviewing step-by-step all the improvements needed.

Please feel free to send me a message in case you have any questions.

Best,

Francesco

Hi Anonymous,

I would recommend to focus on 5 areas to crack a written case; I have reported them below with some suggestions on how to prepare for each of them:

1. Learn how to define a plan of action and stick to that

The first thing you should do in a written case is to define a plan and allocate in the best possible way your time. Assuming 60 minutes for the analysis, a good approach would include:

• initial quick reading – 10-20 min (this may depend on the amount of material)
• structure the approach – 5 min
• make slides/answer to the questions adding detailed analysis and math – 25-35 min
• final review – 10 min

You should then practice to stick to the time allocated, in order to maximize your final performance.

2. Practice graph interpretation

You will normally have to analyse graphs in a written case. The best way to practice is to take graphs from online resources and use a timer to test in how much time you can understand the key message. McKinsey PST graphs could be good practice for that.

3. Work on quick reading and quick understanding of key information

You will not have time to read and prioritize everything, so you have to understand where to focus. The ideal way to practice is to use long cases such as HBS ones, and practice on reducing the time needed to absorb the key information that can answer a defined question. Quick reading techniques could also help.

4. Practice quick math

You will normally have some math to do in a written case. GMAT and McKinsey PST math should work well to prepare on this.

5. Learn how to communicate your slides/answers

If you have to present your findings at the end of the case, I would apply here the same structures of final sum up in a live interview case, that is:

1. Sum up the main questions you have to answer
2. Present your proposed answer and detail the motivation behind
3. Propose next steps for the areas you have not covered

As you will not be able to double check hypothesis with the interviewer as in the live case before the presentation, you should clearly state when you are making hypotheses and that you will have to verify them with further analysis.

When you have to prepare slides I would also recommend to work on:

A) structure the order of the slides

Normally the structure for a 5-slide presentation is the following:

• First slide sums up the question and provides the answer
• Second, third and fourth slide have the supporting arguments for the first slide
• Fifth slide has the next steps

B) structure the content of each slide

There are three basic components for slides:

1. Title
2. Chart or data
3. Label for chart

Many people structure the title as the mere description of what the chart is telling. A great title, instead tells the implication of the graph. Eg say the graph is showing a cost structure for a division. A bad title would be: Cost structure from 2005 to 2015. A good title would be: Cost structure of Division XYZ is not sustainable”. A great title would be Cost structure of Division XYZ is not sustainable due to ABC, assuming you have insides on the cause. The rule of thumb for the title is that if you read all the titles of the slides together you should get a clear idea of what is going on.

C) present the slides

When you present, I would suggest the following steps for each slide:

1. Introduce the slide: “Let’s move to slide 2, which will show us why we have an issue with this division”
2. Present the main message of the slide: “As you can see, we have a cost structure which makes for us not feasible to be competitive in this market”
3. Provide details: “The graph, indeed, shows how our fix cost is XYZ, while competitors can benefit from economies of scale. Indeed…”

Hope this helps,

Francesco

Hello!

Agree with Antonello´s point.

It´s the same kind of thing, but the added difficulty is to process a huge amount of data (relevant & irrelevant) and pages in little time.

Is something that needs prep not to get lost in the detail and be able to be 80-20 in the approach to finish on time.

Good luck!

Cheers,

Clara

Hello!

Agree wtih Antonello, the competencies that are tested in these "written czases" are basically the same. The key part is the ability to manage your time and to handle the large amount of information that you have, and organize it in a 80-20 way.

You can find examples on the website of tMBBs.

Hope it helps!

Cheers,

Clara

Hello!

Written case interviews are indeed becoming very fashionable nowadays as a way to interview!

Remember that the skillset tested is the same than in the "usual" cases, hence, all the practice you may have done totally plays in your favor.

One important point to add is the need to be very 80-20, structured and to the point, since the prep time is very short, so we need discipline with the analysis to have enaugh time to prep the communication strategy.

There are many many entries in thsi same Q&A regarding written cases, hence, I would recommend you to look with the keywords "written case"

Hope it helps!

Cheers,

Clara

Hello!

Skillset needed is the same.

However, look for the keywords "written case" in this Q&A, since you will find supr insightful threads with examples and hints.

Best,

Clara

Hi,
case preparation will be the classical one with 2 additional points to focus on:

• 80-20 prioritization: quickly navigate an important amount of data to find what really matters to the case resolution;
• Executive summary: develop 1-2 pages to present that sum-up the problem and your recommendations.

I have a couple of well done written cases, feel free to text me for sharing.

Best,
Antonello

Hi,

case preparation will be the classical one with 2 additional points to focus on:

• 80-20 prioritization: quickly navigate an important amount of data to find what really matters to the case resolution;
• Executive summary: develop 1-2 pages to present that sum-up the problem and your recommendations.

I have a couple of well done written cases, feel free to text me for sharing.

Best,

Antonello

Hi Justin,

The way you will approach the case is the same as you have been learning & practicising.

Its not a memory test, but take good notes while reading the case. Jot down key numbers and watch out for decoy information.

Otherwise, no need to do anything different. Follow the interviewers lead (if interviewer led) otherwise run the show.

Good luck.

Hi,

Just to add to the rest, focus focus focus.

1) Quickly write down a) Key asks/needs and b) Key insights/context from the prompt

2) Quickly scan through the provided exihibits (i.e. title, quick chart understanding) and eliminate ones that aren't needed

3) In the subset, identify which tell your story the best...adjust as needed, but you should come up with the 3-4 things you need to state ASAP

This is all about taking a ton of information in a short amount of time, and determining what is most relevant.

Hi Justin,

If you think about it, the skills they're testing the are the same!

As in, can the candidate quickly figure an approach from solving a complicated/vague problem, figure out what matters (and what doesn't), pull out key insights that support the answer, and clearly + concisely communicate their view/findings?

So, the same principles apply! As in:

1. Be super super clear on the objective. Focus on this at all times.
2. Figure out what are the key pieces of information that will lead to answering the objective....i.e. what key levers/decisions
3. Ruthlessly cut out any information that doesn't help and figure out which information does (to do this, skim all the materials quickly first...quickly identify what each exhibit is showing, and which don't matter)
4. Grab your insights from the data provided
5. Form a clear recommendation w/ supporting info

Just like a live case!

Hello,

I have some examples that you may use to practice with written cases. Feel free to text me.

Best,
Luca

Hello,

The competencies that are tested are the same. The critical part with the written case is the ability to manage your time and to handle the large amount of information that you have.

You can find good examples also on the website of the major consulting firms.

Feel free to contact me if you want some suggestions on this.
Best,
Luca