Evaluation is crucial to the development and sustainability of Arts Therapy and Arts & Health practices. This guide supports practitioners in their quest to integrate thorough evaluation procedures in their everyday practices by providing practical guidance for designing, planning and implementing bespoke evaluation projects. Based on the authors' experience of designing and realising evaluation projects and running training workshops, a range of suggestions are offered for developing appropriate timelines and collection tools, ensuring organisational diplomacy, and managing what can be a delicate balance of truth, fact and perception. This guide will help practitioners to evaluate their services and projects by taking into consideration the unique profile of the practice, the workplace, clients, project participants, and sectors.