IIDigital MarketingGuide
Writing Case Studies: Reference Projects That Convince in Sales
Almost every business has projects it is proud of. Very few turn them into proof that a prospect can read, check and pass on.
Key takeaways
- A case study is a verified story: starting point, doubt, path, result and whom it suits. It sits on the fourth step of the proof ladder.
- Stories convince when readers recognize themselves in them. Research on narrative transportation shows that identification and credibility work together in this.
- Approval is not a formality at the end but starts with the first request to the customer. If you settle it late, you lose the best projects.
- Case studies only work in sales when they match the prospect’s situation. So sort them by industry and problem, not by date.
Why do good reference projects go unused in sales?
In many businesses there is a project everyone likes to talk about. The customer was satisfied, the result is impressive, the effort was considerable. In sales, it still only appears as one sentence: “We have done something like this before for a customer in the region.” A prospect can neither check that nor pass it on to their managing director.
The central question, then: How does a reference project become a case study that a prospect believes and that sales actually uses? To answer it, we first clarify what distinguishes a case study from a testimonial and introduce a model from research on stories. After that, we cover structure, approval and use in sales.
A reference project that exists only in the owner’s memory is a recollection. A case study is proof.
What is a case study, and how does it differ from a testimonial?
A case study describes a completed project with a customer named by name: the starting point, the approach and the result, ideally with a number, all with the customer’s approval. A testimonial, by contrast, is a short quote expressing a judgment. Both belong to references, meaning all the proof through which customers speak for a provider.
In the article Using testimonials and references, the proof ladder sorts such proof into five steps, from the anonymous quote to the reference call. The case study is step 4 there: a case example with numbers. It takes more effort than a quote, and that is exactly why people believe it more. Boyd, Sese and Tillmanns (2023) describe this with signaling theory: a detailed reference is a credible signal because the customer invests time and reputation in it, and it shows the prospect enough detail to check how well it fits their own situation.
Project report
- Tells what the provider did
- Starts with the service
- Result as an adjective: successful, satisfied
- Customer unnamed or only as a logo
- Ends with self-praise
Case study
- Tells what the customer experienced
- Starts with the customer’s starting point
- Result as a number or verifiable change
- Customer with name, role and their own quote
- Ends with the question of whom it suits
The thinking model: why stories convince
Why does a well-told case study work better than a list of benefits? Research answers this with the concept of narrative transportation. It refers to the state in which readers mentally enter the world of a story because they empathize with the characters and can imagine the course of events. According to the theory, people who immerse themselves in a story in this way adjust their attitudes and intentions to what the story suggests (van Laer, de Ruyter, Visconti and Wetzels 2014).
Van Laer and colleagues brought together the research on this topic in a meta-analysis: 132 effect sizes from 76 published and unpublished studies. Their extended transportation-imagery model distinguishes two sides. On the storyteller’s side are features of the story, such as characters the reader can identify with, a plot the reader can imagine and verisimilitude, meaning the impression that it could have happened this way. On the reader’s side are, for example, attention and familiarity with the topic.
For a case study in business-to-business markets, the third point is particularly important. In two experiments with film trailers, Addis and colleagues (2026) showed that realistic portrayals transport and persuade more strongly than unrealistic ones. A trailer is not a case study, but the direction matches what buyers expect: a story that sounds too smooth loses its effect.
This leaves two readings. One says: in B2B, numbers decide and stories are decoration. The other says: numbers only convince when they are embedded in a story in which the reader recognizes themselves. I consider the second more accurate, with one qualification. The story carries the number, but it does not replace it. A case study without a result is an anecdote; a number without a story is a claim.
The structure: the case study in five scenes
A structure can be derived from the model, which I call the case study in five scenes. Each scene answers a question a prospect asks while reading. The order follows the customer’s story, not the project documentation.
Starting point
Who is the customer, and what was the problem? Industry, size, situation, in two or three sentences. This is where identification arises: readers should think it is just the same for them.
Doubt
What spoke against the order or against the provider? Cost, timing, a bad experience with a predecessor. This scene makes the story credible and anticipates objections.
Path
What was done in which order, and what did not go to plan? An honestly described difficulty increases credibility more than any assurance.
Result
What changed, measured by at least one number? Lead time, cost, downtime, inquiries. With a reference value and a time period.
Fit
Whom does this approach suit, and whom not? This scene helps readers decide whether they should get in touch.
A customer quote belongs in the doubt or result scene, not at the beginning. At the beginning it would look like advertising. In the middle it confirms what the reader has just read. For most purposes the length is one to two pages. Longer is only worth it for large projects that need a lot of explanation.
Approval: ask early, record it in writing
Many case studies fail not in the writing but in the approval. The text is finished, and only then does it turn out that the customer does not want to share numbers, that the legal department has to agree or that the contact person has left the company. Approval therefore starts with the first question to the customer.
| Item | Question to the customer | When to settle it |
|---|---|---|
| Basic consent | May we report on the project, using your name? | At acceptance or shortly after |
| Scope of numbers | Which results may we name, in absolute terms or as percentages? | Before the conversation |
| Quote and person | Who will be quoted, with name, role and photo? | In the conversation |
| Images and logo | May we show photos of the project and your logo? | In the conversation |
| Places of use | Website, proposals, talks, social networks? | With the text approval |
| Duration | Is the approval open-ended, or should we check back in two years? | With the text approval |
File the approval in writing, together with the approved text. An email with clear consent is enough for many purposes; for details on advertising law, data protection and confidentiality agreements, seek professional advice. This is not legal advice.
If a customer declines to be named, the anonymized case study remains. It is weaker but not worthless if industry, size and result stay concrete. State the anonymization openly, for example “a supplier to the automotive industry with 120 employees”. Inventing details for disguise is not an option.
What does a case study cost, and is the effort worth it?
In the article Using testimonials and references, a case example with numbers is estimated at about six hours of effort on the provider’s side. The following worked example distributes this time across the work steps.
Worked example with freely chosen numbers, six hours in total. In practice, coordination often takes longer, but it mostly consumes waiting time, not working time.
Whether it pays off depends on use. Terho and Jalkala (2017) developed a measurement instrument for the systematic use of references in sales, internally for training and proposal work and externally toward prospects. Businesses that used references systematically achieved better sales results. The study shows a correlation, not proof of cause and effect, but it supports a sober calculation: a case study that goes into ten proposals costs six hours once. A case study nobody sends costs them for nothing.
How does sales use case studies?
A case study works when it matches the prospect’s situation. Boyd and colleagues (2023) found among buyers that purchase intentions depended on two things: credibility and fit. A case study from a different industry with a different problem is credible, but it does not fit. That is why the most important work after writing is sorting.
- File by industry and problem. An overview with columns for industry, size, problem and result. That way sales finds the right example in one minute.
- Tell it in the first conversation. Two sentences on the starting point of a similar customer open the conversation about the other person’s situation. How the first conversation is structured is described in the article The first sales conversation.
- Attach it to the proposal. A matching case study next to the price answers the question of whether the provider has managed this before. More on this in the article Proposals that win.
- Show it on the service page. Right next to the offer and the next step, not on a separate reference page that hardly anyone opens.
- Reuse it as an article. The insight from the project, without anything confidential, becomes an article for the website or newsletter.
How articles prepare sales conversations is described in the article Content marketing in B2B. A case study can also be told as a short video with the customer. When that is worth it is discussed in the article Video in B2B sales.
What follows in general
Case studies show a pattern that applies to every form of trust. What can be checked and what costs something is credible. A customer who puts their name to a story that also contains a doubt and a difficulty gives a prospect more certainty than any glossy brochure.
The limits are clear. Research on narrative transportation comes mostly from advertising, entertainment and consumer settings, not from B2B. The findings of Boyd and colleagues are based on listed providers and an experiment with buyers. How strongly a single case study influences a deal cannot be derived from this. What is established is the direction: depth and fit count for more than quantity.
Conclusion and a first step
The question at the start was a reference project becomes a case study that a prospect believes and sales uses. The answer: by having the story begin with the customer, show a doubt and a difficulty, end with a number and say openly whom the approach suits. Approval is settled early, and the finished case study is filed by industry and problem so that it comes up in the right conversation.
- Select the three projects from the last two years that most often match the situation of new prospects.
- Ask the first customer whether they are willing to have a 45-minute conversation and a case study with their name.
- Settle in advance which numbers may be named.
- Hold the conversation with five questions, one per scene.
- Write the text, have it approved and file the approval in writing.
- Create an overview: industry, size, problem, result, places of use.
A case study is the only form of advertising the customer signs for you.
Frequently asked questions
How do I write a case study for my company?
Start with the customer’s starting point, then describe the doubt before the order, the path with an honest difficulty, the result with at least one number and finally whom the approach suits. The text is easiest to create from a short conversation with the customer. The customer approves the finished text.
How long should a case study be?
For most purposes, one to two pages. That is enough for starting point, path, result and a quote. Longer case studies are only worth it for large projects that need a lot of explanation or for specialist audiences.
What do I do if the customer does not want to be named?
Then an anonymized case study with a concrete industry, size and result remains. It is less credible but useful if the anonymization is stated openly. Inventing details for disguise is not an option.
Do I need written approval for a case study?
Yes, file the customer’s consent to text, name, numbers, images and places of use in writing. A clear email is often enough. For details on advertising law, data protection and confidentiality, you should seek professional advice.
Where do I use case studies in sales?
In the first conversation as a short story, in the proposal as an attachment, on the service page next to the next step and as the basis for articles. What matters is that the case study matches the prospect’s industry and problem.
Sources
- van Laer, T.; de Ruyter, K.; Visconti, L. M.; Wetzels, M. (2014): The Extended Transportation-Imagery Model: A Meta-Analysis of the Antecedents and Consequences of Consumers’ Narrative Transportation. Journal of Consumer Research, 40(5), 797-817.
- Boyd, D. E.; Sese, F. J.; Tillmanns, S. (2023): The design of B2B customer references: A signaling theory perspective. Journal of the Academy of Marketing Science, 51(3), 658-674.
- Terho, H.; Jalkala, A. (2017): Customer reference marketing: Conceptualization, measurement and link to selling performance. Industrial Marketing Management, 64, 175-186.
- Addis, M.; Miniero, G.; Ricotta, F. et al. (2026): Narrative Transportation and Cinematic Advertising: The Role of Fantastical Thinking in Unrealistic Trailers. International Journal of Arts Management, 28(3), 18-34.
