A case study is the job most experts say they will “get to at some point.” The reasons are always the same: “I can't share the client's name.” “We didn't measure the result.” “I don't have time.”
Yet for a prospective client who does not know you, a short case study says much more than a long description of your services. It shows what kinds of problems you deal with, how you think and what changed once the work was done. In this article, I explain step by step how to write a short, honest case study.
- Video58
- Case studies and customer stories53
- E-books and white papers45
- Research reports45
- Short articles and posts43
Three parts are enough: problem, approach, result
A good case study does not have to be long. What matters is that the three parts are clear. Each part answers a few questions:
- 1ProblemWhat was the client dealing with? Why did the problem become pressing at that time? What would they lose if it stayed unsolved?
- 2ApproachWhat did you do, in what order, and why? Where did the work get hard?
- 3ResultWhat changed? A number if it was measured. The observed change if it was not.
Problem
Your prospect should recognize their own situation in this part. So describe the problem the way the client experienced it, not in the words of your technical diagnosis.
Approach
You do not need to explain your whole method. Show the key decision points. And do not hide the place where the work got hard. How you got past the difficulty is often the most convincing part of the case study.
Result
If it can be measured, write it in numbers. If not, write the change you observed. Instead of vague praise, write a sentence the reader can picture:
“Meetings became much more productive.”
“The weekly meeting now runs on a one-page report.”
If the result is not clear yet, say so openly.
A single exaggerated sentence can undermine the credibility of an otherwise well-written case study.
If you cannot share the client's name
In many projects you cannot use the client's name. That does not mean you cannot write a case study. Instead of the name, describe the industry, size and context.
For example, instead of “a company,” write “an automotive parts supplier with about 200 employees in the Marmara Region of Türkiye.” Your prospect sees the similarity to their own company through these details.
Still, keep these four points in mind:
- The details should not be so specific that they make the client recognizable.
- Get written permission from your client, even for an anonymous case study.
- If you signed a confidentiality agreement, check it first.
- Do not make up details just because the name is hidden. An anonymous case study must still be based on a real project.
How do you ask for a named testimonial?
A named testimonial is a short statement your client gives with their name, title and company. It makes the case study much stronger. Asking for one is not as hard as it seems, as long as you make it easy for your client.
- Ask at the right time. When the project is done and the result is still fresh.
- Do not send a blank page. Instead of “Could you write a testimonial?”, ask three short questions: What was the problem when we started? What helped you most while we worked together? What is different today?
- Prepare the draft yourself. Turn the answers into a short text. Let your client read it, correct it and approve it.
- Ask for permission explicitly. Ask separately about name, title, company name, logo and photo. Some clients prefer to appear with their title only.
- Respect a “no.” Some organizations' rules do not allow it.
Because these steps repeat in every project, they are also a good fit for an AI agent. An agent that prepares the questions for your client when a project ends, and drafts a case study from the answers, lightens your load. You still approve both the questions and the draft.
Case study and testimonial together: from E2 to E3
On my website, I describe claims with an evidence ladder that runs from E0 to E4. The “E” stands for evidence. On this ladder, the difference between a case study and a testimonial is easy to see:
- It states the year, the project and the result.
- But you are the only source.
- Making the text longer does not change that.
- Your client confirms the same information.
- Your prospect sees two sources.
- Trust no longer rests on your word alone.
So plan the testimonial from the start when you write the case study. When the two appear together, your prospect sees not only what you did but also who confirms it.
Fill-in case study template
Copy the list below into a document and fill it in at the end of each project. The fields left empty show you which information you have not collected yet.
- Title: Which problem was solved, in which industry? One sentence.
- Client: Name, or industry, size and region.
- Your contact: The role of the person who worked with you.
- Date and duration: When did the project start, and how long did it last?
- Problem: Two or three sentences. What was the client dealing with?
- Why at that time: What made the problem a priority?
- Approach: Three to five points. What did you do, and in what order?
- The hard part: Where the work got unexpectedly hard, and how you got past it.
- Result: The measured or observed change, and the source of that information.
- Still unknown: Things not measured yet, or results still pending.
- Testimonial: The statement the client approved and the scope of permission (name, title, company, logo).
- Evidence level: Is this case study E2 or E3? What document or record supports it?
- Next step for the reader: What should someone with a similar problem do?
If you want to see which of your projects could become case studies, the Free Visibility Check is a good place to start. The “Case studies and references” area of the check also shows where you stand on this.
16 short questions, a quick assessment across eight areas. No scoring.
Free Visibility Check