In this article
Where to start
A list of customers who would say yes to being named, and the outcome each got. The target segment, so the case studies you write first are the ones your best prospects will recognise. And a decision about what “result” means in your trade: an order delivered to tolerance, a patient outcome you are allowed to describe, enquiries that rose, a cost that fell, a process that now runs without the owner. Results do not have to be percentages; they have to be true and specific.
Ask the customers now. Most agree, particularly if the case study makes them look competent — which a good one does — and if they see the draft before it is published.
Choose customers and outcomes that reduce the buyer’s risk
The right case study is the one your next buyer would identify with: same industry, same size, same problem, same objection they are carrying into the conversation. A hospital buyer is reassured by another hospital, not by a fashion brand. Pick three to five customers across the segments you actually target, and within each choose the outcome that answers the segment’s biggest worry — reliability of supply, speed of response, a difficult migration done without downtime, a result that held after a year.
Prefer the ordinary success to the spectacular one. A buyer believes “on-time supply for three years, zero rejections” more readily than “400% growth”, and it describes what they want.
Build the problem–action–result story with verified evidence
Three parts, in the buyer’s order. Problem: who the customer is, what they were trying to do, what was going wrong, what it was costing — in their words, from a twenty-minute interview. Action: what you did, specifically and in sequence, including the decision points and the thing that was harder than expected; this is where your expertise shows and where a buyer learns how you work. Result: what changed, with the evidence — a number the customer confirmed, a before-and-after they can see, a quote in their own words with their name and role. Where the result is qualitative, say so plainly rather than inventing a figure.
Keep it to a page. Headline with the outcome, three short sections, one quote, one photograph of the real customer or the real work. Let the customer approve it. A case study a buyer can call the customer to check is the strongest sales document you own.
Deploy it where sales are decided
A case study on the website is table stakes — a page each, linked from the service pages they relate to, so a buyer researching the service finds the proof beside it. The higher-value uses are inside the sales process. In the proposal: the relevant case study on page two, before the price. In the sales presentation: the one that matches this buyer, told as a story. In the follow-up email after a first call: “this is a customer in your situation”. In the objection: “we had exactly that concern at X; here is what happened”. In outreach: a two-line version as the reason to reply.
Cut each case study into three lengths — a sentence, a paragraph, a page — and give the sales team all three. The sentence is the one they will actually use.
Worksheet · use it here or print it
Case-study interview questionnaire
Twelve questions for a thirty-minute call with a customer who agreed to be a case study. Record the call with permission; the quotes come from the transcript, not from memory.
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Mistakes, measures, and getting them written
The mistakes: writing the case study about yourself rather than the customer; inventing or rounding up the result, which one phone call exposes; using an anonymous “leading company” where a name was available; letting them go stale, still citing a customer who left; and writing them once, filing them, and never putting them in a proposal. A safeguard: every case study carries the customer’s approval and a review date.
Measure them by use and by effect: how often the sales team attaches one, whether proposals with a relevant case study close at a higher rate than those without, and whether prospects mention a case study when they enquire. Writing them is the work most SMEs never get to, which is why we do it as a service: the interviews with your customers, the drafts in the three lengths, the approvals, and the pages on the site — starting with the customers your best prospects will recognise.
Questions owners ask
How many case studies does a small business need?
Three to five, one for each segment you target, is enough to cover most sales conversations. Ten thin ones are worth less than three good ones with names and numbers.
What if the customer will not be named?
Describe them precisely without the name — “a 120-bed hospital in north Bengaluru” — and get their approval for that. It is weaker than a name but far stronger than “a leading healthcare client”.
What if the result was modest?
Write it honestly. A modest, believable result in the buyer’s situation persuades more than an implausible one. Buyers have read enough “300% growth” to discount it.
Can a case study be about a project that had problems?
Yes, and those are often the best. What went wrong, what you did about it, and how it ended tells a buyer how you behave when things are difficult — which is what they are actually worried about.
How long does it take to produce one?
A twenty-minute customer interview, a day to write, a week for approval. The interview is the part owners postpone; once it is booked, the rest follows.
What does GullySales do?
The customer interviews, the writing in three lengths, the approvals, the site pages, and the guidance on where each one goes in your sales process. Scoped after the free audit, priced in writing.