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Case Study from Evidence

Write a customer case study for your company: the challenge, your solution, measured results with sources, and a placeholder for the customer's quote.

Works in ChatGPT, Claude and Gemini13 of 20 in Content writing promptsUpdated 18 Oct 2026
  • writing
  • content
  • research
  • beginner

The prompt

Prompt · 4 blanksBlanks in capitals
Write a customer case study for my company from the evidence below, for prospects who are comparing suppliers.

Use this:
- What we sold: OUR PRODUCT OR SERVICE
- The customer (named only if they've agreed): CUSTOMER
- Notes on the project: the problem before, what we did, dates, and results with where each number comes from: PROJECT NOTES
- Where it will be published and how long: FORMAT AND LENGTH

Write:
1. A headline that states the main result, using a number only if it's in PROJECT NOTES.
2. A summary box: customer, industry, size, what they used, and up to three results.
3. Challenge, one paragraph: what wasn't working and what it cost them.
4. Solution, one or two paragraphs: what we did, in what order, and who was involved.
5. Results: a bulleted list, each result followed by its source and period in parentheses, e.g. (ops log, May-Jul 2026).
6. A customer quote placeholder marked QUOTE TO BE APPROVED, with a note on what it should cover.
7. Gaps: every claim that still needs a number, a source or the customer's sign-off.

Rules:
- Never invent results, quotes or customer details. A result without a source goes under gaps, not results.
- Compare before and after only for the same measure over comparable periods.
- If the customer hasn't agreed to be named, describe them instead, e.g. "a 200-person logistics firm".
Insert with the extension

Fill in the blanks

Type your details to see them in the prompt above, then copy it. What you type stays in this tab: it isn't saved or sent anywhere.

Example

OUR PRODUCT OR SERVICE
Routewise, route-planning software for delivery fleets
CUSTOMER
Kestrel Couriers, a 60-van regional courier in Bristol (agreed to be named)
PROJECT NOTES
Before, routes planned by hand and 9% late deliveries (ops log, Jan-Mar 2026). Rolled out over 3 weeks in April. After, 4% late (ops log, May-Jul 2026); fuel spend down 11% (finance report). Ops manager happy to give a quote.
FORMAT AND LENGTH
Website case study page, about 600 words

How to use it

  1. Fill in the blanks above, or paste the prompt into your AI chat and replace the words in capitals there. How blanks work
  2. Save it to your library to use it again. Your copy keeps the blanks, so next time you only fill them in.
  3. Use it where you chat. With the Save My Prompts extension, pick the prompt inside ChatGPT, Claude or Gemini and fill the blanks there.

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