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Marketing Skill

Case Study Writer

Write a persuasive customer case study that proves outcomes and sells the next buyer.

Free skill - no email required

Get the Case Study Writer skill

Install it in Claude as an Agent Skill, or copy it into ChatGPT, Gemini, or any assistant. Same method either way.

What this does and why it matters

A case study is the highest-converting proof asset a firm owns, and most are boring recitations that bury the result. This skill writes case studies as a transformation story (problem, solution, quantified outcome) that a prospect sees themselves in, so the study sells rather than just documents.

Inputs to gather

  1. The client, their situation before, and the problem they faced.
  2. What was done (the solution and the mechanism).
  3. The results, quantified wherever possible, and any client quotes.
  4. The prospect this study should persuade.

Method

1. Structure as a transformation

Before, the intervention, and after. Open on the problem the prospect will recognize in themselves, so they lean in immediately. A case study is a story, not a spec sheet.

2. Make the before relatable and specific

Detail the pain and its cost. The more precisely the "before" matches a prospect's current state, the more the study sells.

3. Show the mechanism, not just the outcome

Explain what was done and why it worked, so the result feels repeatable and credible rather than lucky.

4. Quantify the after

Lead with the numbers: time saved, revenue gained, cost cut, hours reclaimed. Specific metrics beat vague praise. Where a hard number is missing, use a concrete qualitative outcome and flag that a metric would strengthen it.

5. Let the client speak

A real quote in the client's voice adds credibility no marketing copy can.

6. Bridge to the reader

Close by connecting the outcome to what a similar prospect could achieve, with a clear next step.

Output format

ALWAYS use:

# Case Study: [Client] achieved [headline result]
## Snapshot (client, industry, headline metrics)
## The challenge (before, relatable and specific)
## The approach (what was done and why it worked)
## The results (quantified, with client quote)
## Why it matters for you (bridge + CTA)

Anti-patterns to avoid

  • A dry chronology with the result buried at the end.
  • Vague outcomes ("great partnership") with no numbers.
  • All outcome, no mechanism, so it feels like luck.
  • No bridge to the reader's own situation.

Example

A study leads with "Firm X reclaimed 30 hours a week", opens on the manual-reporting pain the prospect shares, explains the automation built, quantifies the time and cost saved, and closes bridging to the reader's own reporting burden.

How to use this skill

In Claude
  1. Download the SKILL.md file above.
  2. Add it to a Claude environment that supports Agent Skills, or attach the file to your conversation.
  3. Make your request and hand over the raw input. Claude triggers the skill automatically.
In ChatGPT or Gemini
  1. Copy the skill text above.
  2. Paste it into a ChatGPT Project, a Custom GPT's instructions, or a Gemini Gem.
  3. Give the model your raw input. It follows the same method and output format.

Frequently asked questions

What does the Case Study Writer skill do?

Write a persuasive customer case study that proves outcomes and sells the next buyer. Use this skill whenever a user wants a case study, a customer success story, a results writeup, or says 'write a case study', 'turn this client result into a story', or 'we have great results but no proof content'. Trigger whenever a client outcome needs to become structured proof that converts prospects.

How do I use the Case Study Writer skill in Claude?

Download the SKILL.md file and add it to a Claude environment that supports Agent Skills, or attach the file to your conversation. Claude triggers the skill automatically when your request matches what it does, then returns a structured first draft.

Can I use the Case Study Writer skill in ChatGPT or Gemini?

Yes. Copy the skill text and paste it into a ChatGPT Project, a Custom GPT's instructions, or a Gemini Gem. Then give the model your raw input and it follows the same method.

Is the Case Study Writer skill free?

Yes. Every skill in the library is free and ungated. Download it, copy it, and use it however you like.

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