How to Write a Case Study a Prospect Will Actually Finish
A case study sent to a prospect is not marketing. It is evidence, submitted to somebody who is deciding whether to risk money on you, and it is being read with the specific question: would this have worked for us?
Which is why the near-universal failure of the form is that the case study is about the sender. It describes what you did, how you did it, which of your services were involved and how pleased everyone was. The reader is trying to find themselves in it and cannot.
Write it about the reader’s situation, not your work
The practical version of that principle is the opening. Do not open with your client’s name and industry unless the prospect shares them. Open with the constraint.
Weak opening: “A leading regional logistics firm approached us to refresh their brand.”
Better opening: “A twelve-person company was losing tenders to larger competitors and suspected their proposals looked amateur next to the field.”
The second one is recognisable to anyone with that problem, in any sector. Match on the constraint, not the industry — that is also the rule for choosing which case study to send in the first place. A prospect with a hiring problem wants your hiring story even if it happened in a different market.
The seven parts
- Who they were, in terms the reader recognises. Size, sector, and the constraint they were under. Three lines.
- The situation before. What was actually happening, with a number if you have permission to use one. Specific enough that it could not be about anyone else.
- What had already been tried. The paragraph nearly every case study omits, and the one that buys the most credibility. If the obvious solution had worked, the client would not have needed you.
- What you did. In enough detail to be checkable by somebody in the trade. Vagueness here reads as either exaggeration or a thin engagement.
- What happened, with the method stated. See below. This is where most case studies quietly become fiction.
- What you would do differently. One honest sentence. It is worth more than three superlatives, because it is the only sentence in the document that could not have been written by a marketer.
- A client quote that says something specific. “They were great to work with” is filler. “They talked us out of the expensive option” is evidence.
Every number needs a method attached
A figure without a method is decoration, and experienced buyers read it as decoration. “Increased conversions by 40%” raises three questions immediately: over what period, compared with what, and measured how.
Two rules keep you honest and, as a side effect, more persuasive:
- Publish only what the client has approved. Ask in writing, name the exact figures, and offer them the option of a range or a percentage instead of an absolute. Many clients who will not let you publish revenue will happily let you publish a ratio.
- State how it was measured, in the same sentence. “Enquiries through the contact form rose from 4 to 11 a month, comparing the three months before launch with the three months after” is a claim somebody can evaluate. The bare percentage is not.
If you have no numbers — which is common and not disqualifying — say what changed in the client’s own words and do not manufacture a metric. An invented statistic is the fastest way to lose a reader who works with data for a living.
One story per document
Sending three case studies is sending none. The prospect will open the first, skim it, and not return to the other two, and you will have spent your one high-attention moment on a menu.
Pick the one that matches their constraint and send it alone. If you genuinely need to show range, send one and offer the others: “I have a similar one from a professional services firm if that is closer to your situation.” That converts a second case study from clutter into a reason to reply.
What to cut
- The process wheel. Nobody buys because of a diagram of your phases.
- Anonymity you did not have to accept. “A major national retailer” is much weaker than a small named company, because the reader cannot verify the first and can verify the second.
- Adjectives about your own work. Let the before-and-after carry it.
- Everything that happened chronologically. A case study is not a diary; skip the months where nothing turned.
What a tracked case study tends to show
Case studies behave differently from proposals in one respect that is worth knowing before you interpret them: they travel. A proposal is read by the people it was sent to. A case study is what somebody forwards when they are making the internal argument for you.
So the useful signal is spread rather than depth — several readers rather than one long read. And a caveat that applies specifically here: a count of readers is a floor rather than a total, because a reader who blocks cookies looks new on every visit, and somebody reading over a colleague’s shoulder never appears at all. Quixli prints that count with an “at least” sign for exactly this reason — what that count really counts explains why the sign only ever runs one way.
One plan note, because case studies are the document people send to strangers most often: on the Free plan the reader counts are shown in full while reader identity is withheld, so you will see a document spreading without seeing who is doing it. What each plan shows is on the pricing page.
Related: what belongs in a capability deck — the document a case study usually arrives beside — and what to put in the quote that follows.