A strong case study does more than describe a service, project or positive experience. It helps the reader understand what changed, what contributed to that change and why the example matters. That means choosing the right story, gathering enough context to explain what happened and being accurate about what one person’s or project’s experience can genuinely show. The most useful case studies bring evidence and human experience together. They make the work easier to understand without turning a real person’s story into a marketing device or claiming more than the example can support.
Write case studies by choosing a meaningful example, gathering enough context to show what changed, and telling the story accurately and respectfully without asking one case to prove more than it can support.
Start by deciding what the case study needs to help someone understand. That might be what a service is like to use, what changed for someone, what funding made possible or how a particular approach worked in practice. Being clear about the purpose helps you choose the right case and gather the right information. It also stops the story from becoming a general description of the organisation or a collection of positive quotes without a clear point. A useful case study should demonstrate something specific. Once you know what that is, it becomes much easier to decide whose experience can illustrate it and which details the reader will need.
People should understand how their story will be used before they agree to take part. That means being clear about why you are gathering the case study, where it may appear, whether they could be identified and how their words, images or experiences may be presented. For charities using case studies in fundraising, the Fundraising Regulator’s Code of Fundraising Practice requires clear and informed permission from anyone who could be identified. Handling participation carefully from the start protects the person involved and usually leads to a better story. People are more likely to contribute openly when they understand what they are agreeing to and how their experience will be represented.
A useful case study needs enough context to show what was happening before, what changed and what contributed to that change. That means going beyond a positive quote or a simple before-and-after account. The reader needs to understand the starting point, what support or activity took place, and what became different afterwards. Where possible, include evidence that helps support the story. That might be feedback, evaluation findings, observations or other information that gives the change more context. It is also important to separate what the person experienced from what the organisation can reasonably claim. Our guide to communicating social impact more clearly looks at this wider relationship between stories, evidence and impact claims. The stronger the context, the easier it is for the reader to understand both the experience and the significance of what changed.
A case study still needs structure, but real experiences do not always fit neatly into a simple challenge, solution and result. Give the reader enough context to understand the starting point, then explain what happened, what role your organisation played and what changed. Where it adds value, include the person’s own perspective so the story reflects their experience rather than only the organisation’s interpretation of it. A clear sequence helps the reader follow what happened, but the structure should not flatten the story or force it into a more positive ending than the evidence supports. The best case studies feel coherent without feeling manufactured. They make the change easy to follow while leaving room for the complexity, uncertainty or mixed outcomes that may be part of the real experience.
Before publishing, check that the story is accurate in two different ways. First, make sure the claims reflect what the evidence can genuinely support. Do not imply that one service caused a change on its own if other factors were involved, and do not turn a positive experience into a broader claim than the case can justify. Second, look at how the person is being portrayed. Would they recognise themselves in the story? Does the language respect their dignity, or does it exaggerate struggle, vulnerability or transformation to make the case feel more dramatic? Case studies should be representative of real situations and any changed details should be made clear. A stronger story does not need to make the experience bigger than it was. It needs to represent it truthfully.
A case study can make change easier to understand, but it should not be asked to prove more than one example can support. One person’s experience can show what a service felt like, how a particular change happened or what an outcome looked like in practice. It cannot automatically show that everyone had the same experience or achieved the same result. NPC’s guidance on case studies makes this distinction clearly. It notes that individual cases are not necessarily representative and recommends looking beyond only the most successful examples when trying to understand impact. Case studies are strongest when they add depth and human context to wider evidence. They can illustrate the impact your organisation is seeing, but they should not replace the broader evidence needed to support claims about what is happening across a service, programme or organisation.
The strongest case studies make a real experience easier to understand without turning it into a marketing device or asking one story to prove more than it can. When the purpose is clear, the evidence is handled carefully and the person is represented with accuracy and respect, a case study can add depth, context and humanity to the wider story of your impact.
If you have strong stories but are struggling to turn them into clear, credible case studies, we can help you shape the evidence, context and human experience into something people can understand and trust