How to write your UX case study
As you write your case studies, don’t worry about length. Once you get it all on paper you can decide what to put into your portfolio. As you transition your written case studies to something more visual, you will edit them down and also consider how some of the text can be communicated visually.

Step 1. Give your project a title
The big mistake that people make is not giving the project title enough detail when a strong title can give context for the project.

Good: Home Depot user research for mobile app checkout

So-so: Home Depot user research

Bad: Home Depot

Step 2. Write an outline
Lay out your thoughts before you start giving up the details. An outline’s purpose is to help you understand the “big picture” of your project, so you can decide how to structure your case study or if the project is big enough to merit more than one case study.

Start your outline with the seven sections listed above, and start filling in bullet points under each section. Don’t worry about sentence structure; just write and get it out of your head. If you’ve been documenting your projects as you work on them, then you may have some of this already written.

Step 3. Fill in the details
Now that you have an outline and you see the big picture, you can start filling in details. 

Give the “Process and what you did” section the bulk of your effort. This is where you’ll document the steps you took, just like documenting science experiments in high school. 

You should be answering these questions:

What did you do? For example, what research method did you use?
Why did you do it?  For example, why did you choose that research method?
What was the result?  For example, did you achieve your research goals?
What did you learn? For example, what would you do differently next time?
Continuing with our (completely fictional) Home Depot example:

BAD: “We did usability testing on the checkout of the Home Depot mobile app.”

Why is this weak? Because it only tells the reader what you did. It doesn’t address why you did it, what happened, and what you learned.

GOOD: To evaluate the new checkout on the Home Depot mobile app, we relied on usage metrics in conjunction with 8 usability tests. This allowed us to gain deeper understanding through combining both qualitative and quantitative information. Although users were able to get through the checkout more quickly, they continued to struggle with the shipping section. Discussions with users discussion revealed that often times, products in one order have different shipping addresses, which was possible, but difficult in the current checkout.
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