Editor J. Bradley Cousins and colleagues meet the needs of evaluators seeking to implement collaborative and participatory approaches to evaluation in Collaborative Approaches to Evaluation: Principles in Use. Using a multi-phase empirical process to develop and validate a set of principles to guide collaborative approaches to evaluation, the book outlines the principles that the team developed, and then provides case studies of how these principles have been applied in practice. The case studies draw on programs globally in education, health, and community development. The book is an invaluable supplementary text for program evaluation courses where students’ projects are focused on more collaborative and participatory approaches, and it is an essential resource for practicing evaluators and those who commission program evaluations.