A case study is a short written account of one project: what the client needed, what you did about it, and what changed as a result. On a small-business website it is usually the last page a serious prospect reads before they email you. It is also, on most sites, the weakest page there.
The failure mode is easy to spot. The page lists what was delivered — logo, business cards, website, social templates — adds a line about how much the client loved it, and stops. That is a receipt, not a case study. A stranger reading it learns nothing about whether you can solve the problem sitting on their desk.
Writing a better one is not a talent problem. It is a structure problem, and the structure is short enough to learn in an afternoon.
Why strangers read your case studies before they ever contact you
Buyers do most of their deciding before they talk to anyone. 6sense’s 2024 Buyer Experience Report found that business buyers are roughly 70 percent of the way through their process before they contact a seller, and that 81 percent already have a preferred vendor by the time they make first contact.
That research covers larger purchases than a five-figure brand or website project, but the shape holds at any size. By the time someone fills out your contact form, they have read your services pages, looked at your work, and quietly compared you against two or three other options. Your case studies did the arguing while you were asleep.
The takeaway: write case studies for the person who will never ask you a question — not for the client who already hired you.
One project, one problem, one outcome
The most common mistake is scope. A case study that covers four years of work for one client, across a logo, two websites, a trade-show booth, and an email program, has no argument in it. It is a career summary wearing a case study’s clothes.
Pick one engagement with a beginning and an end. If a client relationship genuinely spans years and several distinct projects, write the strongest one as a case study and mention the rest in a single closing sentence. Readers can handle “we have worked together since 2019.” What they cannot handle is five stories braided together.
Lead with the constraint, not the deliverables
Every project worth writing about had something that made it hard: a budget that ruled out the obvious answer, a content library nobody had sorted in a decade, two audiences who wanted opposite things, a launch date tied to an event. That constraint is the most interesting sentence available to you, and it is the one most case studies leave out.
Constraints are also what prospects recognize. Nobody arrives at your site thinking “I need a responsive image grid.” They arrive thinking “I have 400 pieces of work and no idea how to show them.” A site built for Santa Fe artist Jay Pearson — a collaboration where Monsoon Design handled the identity and I did the web design and WordPress build — turned on exactly that kind of constraint: the design had to defer completely to the art, and the archive of works had to stay open-ended, so the structure was a custom post type and a layout that refuses to compete with the images. Written as a deliverables list, that project sounds like every other portfolio site. Written as a constraint, it tells an artist with a storage unit full of work that someone has solved their problem before.
The five parts worth writing
A usable case study has five moves. In order:
- The situation. Who the client is, in one sentence a stranger understands without context. “A two-location veterinary clinic that had outgrown a template site” beats “a valued long-term client.”
- The constraint. What made this harder than the textbook version.
- What you decided. Not what you produced — what you chose, and why you chose it over the alternative. This is the section that demonstrates judgment, and judgment is what someone is actually shopping for.
- What changed. Measured if you have numbers, observed if you do not. “Staff stopped forwarding intake emails by hand” is a real outcome even without a percentage attached.
- One quote from the client. One. A specific sentence in their own voice does more than four paragraphs of praise.
Notice what is missing: a list of every file you handed over, the software you used, and a closing paragraph inviting the reader to contact you. The first two belong on a services page. The third is already everywhere else on your site.
Write it plainly — promotional language measurably costs you
This is where most case studies go wrong at the sentence level. The writing inflates: a website becomes a transformative digital presence, a logo becomes an iconic mark, a schedule becomes a seamless process.
There is old and well-tested research on this. In a study by Nielsen Norman Group, rewriting a web page in objective language — the same information with the boasting and subjective claims stripped out — improved measured usability by 27 percent. Combining that with concise, scannable writing improved it by 124 percent. The researchers’ explanation is the useful part: readers question promotional claims, and questioning them distracts from understanding what is actually being said.
So: say the restaurant had three menus in circulation and no one knew which was current. Do not say you delivered a unified brand experience. The first sentence makes the reader nod. The second makes them wonder what you are hiding.
What if the client won’t let me share numbers?
Then write the case study without them, and do not treat that as a disqualifying problem. Most small businesses cannot publish revenue, and a surprising share do not track anything that would make a clean before-and-after. You have three substitutes, and all of them work. First, ask for a range or a direction instead of an exact figure — many clients who will not publish a dollar amount will happily approve “inquiries roughly doubled in the first quarter.” Second, describe the operational change, which is often more persuasive anyway: a booking process that used to take three phone calls now takes one form. Third, quote the client on the outcome; their sentence carries the claim, and you are not the one asserting it. Ask at project close, while the relief is fresh — permission is much harder to get six months later, when everyone has moved on.
How long, how many, and where they live
Length: 300 to 800 words is plenty for most projects. The five moves above do not need more, and a 2,000-word case study gets skimmed down to roughly 400 words anyway.
Count: five or six genuinely specific case studies beat twenty thin ones. If you serve distinct types of client, cover each type once rather than stacking four examples from the same industry.
Placement matters more than people expect. Each case study should be its own page at its own URL, so it can be sent in an email, found by search, and cited by an AI assistant answering a question about your industry. A rotating homepage carousel of project images is not a case study library — it is a slideshow that search engines and prospects both scroll past. Link each one from the service page it proves, and link back the other way.
Start with the project you still think about
If writing six of these feels like a project in itself, write one. Pick the job you still describe out loud when someone asks what you do — that instinct is usually right, because the story already has a constraint and an outcome in it. Draft it in the five moves, strip the adjectives, send it to the client for a quote, and publish it.
Patrick Iverson is a brand strategist and web designer in Santa Fe, New Mexico, and has run an independent practice here since 2001. If you are staring at a portfolio page that lists deliverables and want it to argue for you instead, that is a conversation worth having.
