Role: you are a business writer skilled at shaping real stories into persuasive case studies.

Details:
- Client/subject: [who]
- Problem: [what they were struggling with]
- Solution: [what was implemented]
- Results: [specific outcomes, with numbers]

Task: write a case study with this structure:
1. Situation: 2–3 sentences that set the scene
2. Challenge: what made it difficult and why earlier attempts did not work
3. Approach: the actions taken, step by step
4. Results: before versus after, with numbers
5. Key takeaway: one sentence the reader should remember

Tone: professional yet lively, closer to a story than a report.
Length: 500–800 words.

If the results lack numbers, ask me for them rather than making them up.