Proof beats claims: why case studies win enquiries

Why does proof persuade more than adjectives?

Because readers doubt claims, and the doubt gets in the way. In a 1997 study by John Morkes and Jakob Nielsen, the same website scored 27% higher in measured usability when it was written in an objective style instead of a promotional one. Users “detest anything that seems like marketing fluff,” the authors wrote, and doubting it may distract them from what the page says (Nielsen Norman Group, Concise, SCANNABLE, and Objective, 1 Jan 1997). The study is old, so read the number as a rough guide.

Google asks its search quality raters to look at a site the same way. Its guidelines call trust “the most important member” of E-E-A-T, its shorthand for experience, expertise, authoritativeness and trust. Raters are told to check what independent sources say about a business, and where those disagree with what the business says about itself, to “trust the independent sources.” No single rating moves a page up or down; Google uses the ratings to check how well its search is working (Google, Search Quality Rater Guidelines, 11 Sep 2025).

AI assistants respond to the same thing. In tests for the paper that named generative engine optimization, adding quotations or statistics to a page raised its visibility in AI-written answers by about 30 to 40% on one of its two measures, and citing sources by about 27%, while stuffing in keywords didn’t perform well (Aggarwal et al., GEO: Generative Engine Optimization, KDD 2024). A case study is made of that material, and our guide to AI answers covers what else the assistants look for.

Will people believe the case studies on your own site?

Only partly, so make them checkable. In a Nielsen Norman Group study published in 2016, participants liked the quotes and case studies on company websites but treated them with “a healthy dose of skepticism.” They wondered whether the stories were true and noted that a company would only show the good ones. Every participant said they would read reviews before hiring, and they trusted reviews on other sites more (Nielsen Norman Group, Trustworthiness in Web Design: 4 Credibility Factors, 8 May 2016).

So give the reader ways to check. Name the client when they agree, link to their website, show the work in photos, and link to your Google reviews (how to get more of them inside the rules).

Perfect looks suspicious, too. Northwestern University’s Spiegel Research Center found that the likelihood of buying a product usually peaks at star ratings between 4.0 and 4.7, then falls as ratings approach 5.0 (Spiegel Research Center, How Online Reviews Influence Sales, first published 2017). That research is about products sold online. We think the same holds for case studies: the one that admits what was hard reads as more believable than the one where everything went right.

What should a good case study contain?

One project, told in the order it happened, on its own page. Google’s guidance for review pages asks for evidence of first-hand experience, such as photos, and for quantitative measurements (Google Search Central, Write high quality reviews, 10 Dec 2025). The same habits make a case study work.

• Who the client is. Use their name if they agree, or describe them by trade, size and city if they don’t.
• The problem, in the client’s words if you can get them, and what it was costing them.
• What you did, in order, and how long it took.
• What changed, with a number, a period and how you counted it. “Enquiries per month, counted from the booking sheet, March against June” is checkable. “Huge growth” isn’t.
• Something the reader can see: before and after photos, a screenshot or a plan.
• A short quote from the client, in their own words.
• What didn’t go to plan, and how you handled it.
• The project date and who did the work.

Write the starting figure down before the project begins, or you’ll have nothing to compare at the end. We do this on our own projects: every number we report is measured against a dated starting point (Aurora Owl, Services).

How do you gather proof without breaking a client’s confidence?

Ask in writing, show them the draft, and leave out anything they don’t want shared.

1. Raise it at the start: you may ask to write the project up, and nothing goes live without their approval.

2. When the work is done, send the draft and ask them to approve each part in writing: name, numbers, photos and quote.

3. If they’d rather not be named, anonymize properly. Describe them by trade, size and city, and remove logos, addresses, faces and any figure that only they would have. A percentage change often tells the story without revealing their revenue.

4. Keep their quote as they said it, and keep it current. In India, any endorsement in an advertisement must reflect the “genuine, reasonably current opinion” of the person giving it, and must be based on adequate information about, or experience with, the service (Central Consumer Protection Authority, Guidelines for Prevention of Misleading Advertisements and Endorsements, 9 Jun 2022, clause 13).

5. Get consent for anything personal. The UAE’s Personal Data Protection Law prohibits processing personal data without the owner’s consent, apart from some legal and public-interest cases (UAE Government portal, Data protection laws). We treat a client’s name, photo and quote as personal data, and keep their written yes on file.

If a client says no to being named, an anonymized version still shows a stranger what you can do.

Where does proof go on your website?

Next to the claim it backs up. Give each case study its own page and link to it from the service it proves. A page per case study also gives Google and AI assistants something clear to quote, as our post on one page per service explains.

This is the work our Evidence package adds to a website: everything in Essential, plus case studies and proof pages from your own work, and pages that answer the questions your buyers search for. If your site is already live, content and proof is a one-time service of its own, with case studies, guides and question pages. Our post on choosing a package walks through four questions, one of them whether you have finished work you can show.