Arts organisations and practitioners may be contracted by local hospitals, care homes, GP surgeries and community and third sector organisations to support a range of health and wellbeing outcomes for participants. In this context, ‘co-production’ of both projects and evaluation with commissioners, partners and service users becomes particularly important. Taking a collaborative approach to evaluation with your stakeholders, can help ensure that the outcomes you want to evidence are the right ones. Working with independent evaluators or academics can also help to make sure that the language and evaluation methods you use are appropriate.