What should your marketing case study help someone decide?

Choose one buying question before choosing the customer. Write it at the top of your notes: can this service solve a problem like mine, and what would the work involve?

A marketing case study describes a real project through its challenge, actions and outcome. That basic definition follows HubSpot's explanation of case studies. Use those three parts to check whether you have a story worth developing.

For a hypothetical email consultant, the buying question might be whether a small shop can run a welcome campaign with its existing team. Look for a project that lets you explain the practical work. Leave unrelated services for another story.

• Choose a customer your intended reader can relate to.
• Check that you can describe your contribution clearly.
• Find the records behind the claimed result.
• Confirm that someone can review the finished draft.

Write a sentence describing the value you want to demonstrate. If that sentence stays vague, work through your value proposition before arranging the interview. Avoid promising a particular result to every future customer.

How do you get customer permission without making it burdensome?

Send a small, specific request. Explain what you want to discuss, where the story would appear and what you need the customer to approve. Offer to do the writing yourself.

Customers may have internal approval rules involving managers or legal teams. Content Marketing Institute's participation guide recommends a clear request process. Ask who owns that approval before setting a publication deadline.

A request you can adapt

Hi [name], would you be open to a short customer story about [project]? We would discuss the original challenge, what each team did and the results we can support.

We would prepare the draft for [website and agreed channels]. You would review the wording, quotes, figures and use of your company name or logo before publication. Please let us know what should remain private and who should approve the final version.

This is a suggested message, not a quotation from a customer. Add your proposed interview length and the actual channels. Keep the final approval attached to the version it covers.

If naming the business is uncomfortable, discuss an anonymous version. Check whether the remaining details would still identify it. If the customer declines participation, choose another project and move on.

Which case study interview questions produce useful material?

Ask about events, choices and evidence. Invite the customer to describe the work in their own words. Keep your suggested conclusions out of the question.

1. What was happening before the project started?
2. Where did that problem show up in an ordinary working day?
3. What had you already tried?
4. What made you decide to take action?
5. What concerns did you have about our proposed approach?
6. What did your team need to contribute?
7. What changed, and where can we check it?
8. What remains difficult or unfinished?

When someone says the work became easier, ask for a concrete example. They might describe a handover, a decision or a task. Record that description without turning it into a time saving you have not measured.

Keep three kinds of notes

Separate documented facts, personal opinions and open questions. A customer saying they feel more confident belongs under personal opinion. A dated record showing a completed task belongs under documented facts.

Ask permission before recording the conversation. If you tidy a quotation for readability, send the edited wording back for approval. Never write an enthusiastic sentence yourself and put it in the customer's mouth.

Afterwards, arrange the material around a clear sequence. The guide to storytelling in marketing can help you shape that sequence. Keep the customer's actual decisions at its centre.

How should you structure a case study?

Open with the customer, the challenge and a brief account of what changed. Then explain the decisions and work behind that change. Give the reader enough detail to judge whether the approach fits their situation.

Use this case study template as a drafting worksheet. Fill the evidence column first. Where it remains empty, add a question for the project owner.

A fill-in opening

[Customer] needed to address [specific problem] while working within [constraint]. Our team handled [scope], and the customer handled [their contribution]. During [documented period], [named record] showed [verified observation].

For a B2B case study, meaning a story about one business serving another, explain who approved the work and who used it. Include any training or handover the project required. When adapting the story for a business proposal, keep those responsibilities visible.

How do you show results without overstating them?

Put the measure, period and source beside each result. Check that the starting and ending figures describe the same thing. Record any other changes that could matter, such as a different offer or budget.

Semrush recommends collecting customer background, product usage and outcome information during preparation. Its case study writing guide also uses that research to identify missing information. Make a simple evidence list before drafting your headline.

Hypothetical example: a small online shop

Imagine you helped a shop rewrite its abandoned basket emails. Gather the approved messages, sending records and completed order records. Describe what was changed before making a claim about what those changes achieved.

If the shop also introduced a discount, include that detail. If you cannot separate the effects, describe the observed outcome and the uncertainty. Do not assign the entire change to your writing.

This is an illustrative scenario, not a reported customer success story. Use your own records to complete it. For help distinguishing a recorded sale from credit assigned to a marketing activity, read the guide to marketing attribution.

• Keep enquiries, orders and paid orders separate.
• Do not calculate growth without a reliable starting value.
• Label estimates and explain how they were made.
• Remove a numerical claim if nobody can verify it.

When commercial figures cannot be shared, ask whether a specific process change can be described instead. State what the evidence actually shows. Keep any wider business benefit as an open question until it can be checked.

How long should a case study be?

Use the space needed to explain the decision and support the result. My recommendation is to draft a short summary first, then expand the parts a prospective customer would reasonably question.

For example, a complicated handover may deserve its own section. A straightforward copywriting project may need only a short account of the brief and revisions. Remove background that does not help the reader understand the work.

Choose a practical case study format

• Website article: use clear headings and place evidence near the relevant claim.
• Sales handout: select the essentials from the approved story.
• Presentation: give each main decision enough space to explain.

Draft in a document your team already uses, such as Word or Google Docs. Leave visual design until the facts are settled. Check that any chart labels explain exactly what is being compared.

What should you check before publication?

Ask one person to verify the facts and another to read for clarity. Then send the final version to the customer. Treat approval as applying to that version and its agreed uses.

1. Check names, job titles, figures and periods.
2. Compare each quotation with the approved wording.
3. Remove private information from screenshots.
4. Confirm permission for names, logos and channels.
5. Test whether the next step matches the story.

For this week's work, aim to finish the research and an approval-ready draft. Do not promise publication before the customer has responded. Keep unanswered questions in a separate list so someone can resolve them.

Once published, note which questions readers ask and which conversations refer to the story. Select useful measures with the guide to choosing business KPIs, meaning the measures you use to judge progress. Review the content when the service or evidence changes.