The testimonial is not the case study
A testimonial is a quote. A case study is a story. Quotes are nice. Stories are how humans decide who to trust.
Most "case studies" you see are testimonials wearing a tuxedo: "Working with X was amazing, they delivered on time, five stars." That's not a case study. That's a review with formatting.
A real case study has a shape. Three parts. Miss any of them and it collapses into marketing.
The three-part shape
| Part | What it answers | The trap |
|---|---|---|
| Before | What was on fire? | Skipping straight to the win |
| Mechanism | What did you actually do? | Vague verbs ("we optimized") |
| After | What's verifiably different now? | No numbers |
The middle part is where 90% of case studies die. "We worked our magic" is not a mechanism. "We cut the form from 14 fields to 3 and added a single CTA above the fold" is a mechanism. Mechanisms are checkable. Magic is not.
The before must hurt
A weak "before" makes the "after" look weak. If the before was "things were okay," the after of "things are great" is a 5% improvement. Who cares?
A strong before is honest about pain. "The team was about to lay off half the company." Now the after — "we saved the team and shipped the round" — has stakes. The reader leans in because the before had teeth.
Don't sanitize the before. The dirtier the before, the shinier the after.
The number rule
Every case study needs one number. Not seven. One.
"Cut onboarding from 12 steps to 3. Activation rose 34% in 60 days."
That number is the anchor. It's what a reader repeats to their boss in the meeting you're not in. The rest of the case study is context for that number.
If you can't find the number, the case study isn't ready. Either go get the data, or wait until you have a story with stakes.
The format that travels
Case studies have two lives. Long-form for your site. Short-form for everywhere else.
The short version is one sentence: "We did X for Y, result was Z." That sentence is the seed. Every LinkedIn post, every sales email, every DM should be able to carry it. If the long-form case study can't compress to one sentence, the long-form is bloated.
Your playbook for this lesson
- Pick your strongest client outcome from the last 12 months.
- Write the three-part shape. Be honest about the before — the dirtier, the better.
- Find one number. If you can't, go ask the client for the data. Don't ship without it.
- Compress to a one-sentence version. If it won't compress, the story isn't sharp yet.
- Publish the long version on your site. Use the one-sentence version everywhere else.