A B2B case study is evidence. It shows a prospect that a company like theirs had a problem like theirs and solved it with your help, with results they can believe. Sales teams use case studies at almost every stage, from first outreach to final approval, because they answer the question every buyer is silently asking: has this worked for someone like me?
This guide focuses on the process behind a strong B2B case study, especially the customer interview. For shorter formats and examples for service businesses, see our guide on how to write a case study.
Choosing the Right Customers
The best case study subjects match the prospects you want more of, achieved measurable results, and are willing to be named. Ask account managers for customers who are enthusiastic, recently renewed or expanded, or regularly act as references. Aim for a portfolio across your main industries, company sizes and use cases, so sales has a relevant story for most deals.
Securing Approval Early
Many case studies die in legal review. Ask for agreement in principle before the interview, explain exactly how the story will be used, and offer the customer approval of the final draft. If a named case study is impossible, an anonymized version with the industry and size described can still help, though named stories are more persuasive.
The Customer Interview
A 30 to 45 minute conversation with the customer champion provides most of the material. Record it with permission. Useful questions:
- What was happening in your business before you started working with us?
- What was the problem costing you in time, money or risk?
- What else did you consider, and why did you choose us?
- What was implementation like? What surprised you?
- What has changed since? Can you put numbers on it?
- What would you tell a peer considering the same decision?
Follow up on vague answers. "It saved us time" becomes useful when you ask "roughly how many hours a week, and for how many people?"
The Structure
| Section | What it covers | Length |
|---|---|---|
| Headline | The result, ideally with a number | One line |
| Summary | Customer, challenge, solution, top results | Three or four sentences or a sidebar |
| Challenge | The situation and its cost | One to two paragraphs |
| Solution | What was implemented and how | Two to three paragraphs |
| Results | Measurable outcomes and qualitative benefits | Bullets plus a paragraph |
| Quote | The customer's own words | One or two quotes |
Using Numbers Well
Specific, verified figures make a case study credible: "invoice processing time fell from five days to one" beats "dramatically faster". Agree every figure with the customer, state the time frame, and avoid implying causation you cannot support. Where exact numbers are confidential, percentages or ranges approved by the customer still help.
Formats for Sales
- A one-page PDF that sales can attach to emails.
- A web page with the full story for search and sharing.
- A slide for sales presentations.
- A short quote and result for proposals and landing pages.
- A video interview, when the customer is willing.
Writing the Story
Write the case study as a story about the customer, not about your product. Open with the result or a striking detail of the challenge, then explain the situation in the customer's terms. Describe the solution concretely: what was implemented, by whom, over what time frame, and what obstacles were overcome. Let the customer's voice carry the most important claims through quotes. Keep paragraphs short and add a summary box for readers who scan. Avoid superlatives and jargon; specific details are more convincing than adjectives.
Getting Quotes That Work
The best quotes sound like a person talking, not a press release. Use the customer's own words from the interview, lightly edited for clarity, and ask them to approve the wording. Strong quotes do one of three things: describe the pain vividly, explain why they chose you, or state the result in human terms. "We used to dread month-end. Now it's a non-event" says more than "We are extremely satisfied with the solution."
Building a Case Study Library
Plan case studies as a portfolio rather than one-offs. Map your target segments and common objections, then aim to have at least one relevant story for each. Track which case studies sales uses most and which help win deals, and refresh older stories with updated results. A library of ten well-chosen case studies, kept current, is worth far more than thirty that nobody can find.
Frequently Asked Questions
Ask about the situation before, the cost of the problem, alternatives considered, why they chose you, the implementation, measurable results and what they would tell a peer.
Typically 500 to 1,200 words for the full version, with a one-page summary for sales. Length matters less than specific, credible results.
Ask satisfied customers early, explain how it will be used and promoted, minimize their time commitment, and give them approval of the final version.
Yes, if the customer cannot be named, describe their industry and size instead. Named case studies are more persuasive, so ask for permission first.