How to Write Better Case Studies

Most agency case studies are polite, accurate, and largely forgettable. They list what was delivered. They describe the process. They include a few positive results. And yet, they rarely help a prospective client make a decision. Because that is not what the reader is looking for.

When a marketing or brand director reads a case study, they are trying to answer a much more practical question. Can this agency deal with a situation like mine?

That requires something different.

Not more detail. Better judgement.

Start with the situation, not the work

The most useful case studies begin before any work starts. They describe the position the client was in. What had stalled. What needed to change. What was at risk if nothing did.

This is where many agencies stay too vague.

“Increase awareness” tells the reader very little.

“Growth had flattened after three years, with no clear route into a new category” gives them something to recognise.

That level of clarity matters. It signals experience. It also helps the right clients see themselves in the problem.

Capture it while it is still fresh

The quality of a case study is often decided by when it is written. If you leave it too long, detail disappears. Decisions get simplified. The reality of the work is replaced with a cleaner version that is easier to write, but less useful to read.

As soon as a project closes, you should have an easy, defined process to capture:

• The original brief, in the client’s words

• The constraints that shaped the work

• What changed during the project

• Where decisions were difficult

• What the client valued most in the end

This does not need to be a heavy process. But it does need to happen while the detail is still there,if you leave it too long, the nuances and details will be forgotten

Show how you think

Many case studies focus too heavily on what was produced. Campaigns, assets, platforms, content. These are important, but they are not what a prospective client is trying to assess.

They want to understand how you think.

A stronger case study makes your decision-making visible. It shows:

• What you chose to prioritise, and what you did not

• Where you challenged the brief

• What trade-offs were made

• How your thinking shaped the outcome

This is what builds confidence. It gives a clearer sense of what it is like to work with you when things are not straightforward.

Be explicit about the business objective

There is often a gap between what a client asks for and what the business actually needs. Good case studies close that gap.

They make clear:

• The commercial or strategic objective

• How success was defined at the start

• How your work contributed to that outcome

This does not need to be complex. But it does need to be clear.

If a reader cannot quickly understand what changed for the business, the case study is not doing its job. Strong examples of this are often seen in IPA effectiveness case studies.

Handle results with a bit more honesty

Results are where case studies often become either inflated or unclear. Neither helps.

It is true that some clients are cautious about sharing data. But that can usually be managed earlier in the relationship:

• Agree how success will be measured from the outset

• Include data sharing in the agreement where appropriate

• Use directional indicators if exact figures are sensitive

• Focus on business impact, not just metrics

“Improved engagement” is easy to write, but difficult to trust.

“Shifted perception from price-led to quality-led within a defined audience” is more useful, even without a number attached.

The discipline of agreeing success early tends to improve both the work and the case study.

Structure for how people actually read

Case studies are rarely read from start to finish. They are scanned. That means structure carries more weight than most agencies expect.

A simple format works well:

• Context

• Challenge

• Approach

• Key decisions

• Outcome

• Reflection

Keep sections short. Use headings that say something meaningful. Include quotes where they add perspective, not just praise.

The aim is not to reduce everything down. It is to make it easier to take in.

Use imagery, and video, with intent

Imagery should help the reader understand the work more quickly.

Not just make the page look better.

Use it to:

• Show what changed

• Highlight key moments in the work

• Make the outcome more tangible

Video can be especially effective here. It is often the strongest medium for showing work in context, movement, or interaction. But keep it short. Its job is to clarify, not demand more time from the reader.

Poor or generic imagery has the opposite effect. It suggests a lack of care at the point where it matters most.

If the work is visual, it is worth documenting it properly.

Add a human perspective where it helps

One of the simplest ways to strengthen a case study is to include a human view. A short client reflection. A brief comment from the team. A simple recorded clip.

These do not need to be overly polished. In fact, a slightly rough edge often makes them more believable.

They give a clearer sense of the working relationship, which is often what a prospective client is trying to judge.

Keep it useful

Case studies do not need to be long. But they do need to be considered.

The aim is not to capture everything that happened. It is to show enough of the right things for someone to make an informed judgement.

That means being:

• Specific where it matters

• Clear about what changed

• Honest about the complexity

• Consistent in how you present your work

A good case study will not appeal to everyone.

It will help the right client recognise that you are worth a conversation.