How to Write a Case Study

A Marketing Case Study Is Not Homework

An academic case study analysis argues toward a grade. A marketing case study argues toward a sale. The reader isn't checking your framework, they're checking whether a company that looks like theirs solved a problem that looks like theirs.

Some surveys of B2B marketers describe case studies as one of the more trusted content formats for moving a prospect through a longer sales cycle, particularly once a buyer is comparing shortlisted vendors rather than browsing options.

That trust comes from specificity, not polish. A vague story with impressive-sounding numbers convinces fewer people than a precise story with modest ones.

What Makes Case Studies Effective

• Specific, relatable problems that mirror the reader's situation
• Measurable results with clear baselines and timeframes
• Direct quotes from customers in their own words
• Honest mention of challenges, not just smooth sailing
• Concrete implementation details, not vague promises

Picking the Right Customer

Look for a customer with a specific, relatable problem, a measurable result, and a willingness to be named and quoted. A recognizable brand helps, but a persona your target buyers see themselves in matters more.

Resist the pull toward the customer with the biggest raw numbers if their story is generic. A mid-size company with a sharply told problem usually outperforms a logo-brand customer with a fuzzy one.

It also helps to ask the account team, not just the customer, who's easy to work with. A customer with a great result but a habit of missing deadlines on approvals can stall a case study for months.

Customer Selection Criteria

The Interview: Before, During, After

Before the call, send your questions ahead, research the account, and have a rough sense of what number you're hoping to land on so you can ask the right follow-up.

During the interview, walk through three phases in the customer's own words: before, what were they doing, what wasn't working, what triggered the search for something new; during, what did evaluation and onboarding actually look like, including any internal pushback; after, what changed, and what would they tell a peer weighing the same decision.

After the call, get every quote approved in writing, confirm the headline numbers with a second source when you can, and send the full draft back for sign-off before it goes anywhere near publication.

Interview Preparation Steps

1. 1
   Send interview questions

   Send interview questions 2-3 days before the scheduled call

2. 2
   Review account history

   Review the account history with the sales or customer success team

3. 3
   Research the customer

   Research the customer's industry and recent company news

4. 4
   Identify the target metric

   Identify the specific metric or outcome you want to capture

5. 5
   Prepare follow-up questions

   Prepare follow-up questions to dig beyond surface-level answers

6. 6
   Understand implementation

   Have a clear understanding of implementation timeline and process

Writing the Problem-Solution-Results Narrative

Open with the stakes, not the vendor. Describe the problem in the customer's language, walk through the solution and implementation without turning it into a product manual, then close with quantified results and a direct quote that does the emotional work the numbers can't.

Keep your own product mentions restrained throughout. The customer should read as the protagonist of their own story, with your company as a supporting character, not the other way around.

Break up long paragraphs with a pull quote or a simple before-and-after stat block. Most readers of a case study are scanning for proof, not reading start to finish, so the results need to be visible to someone who only reads headlines and bolded numbers.

Case Study Usage Metrics