Editor J. Bradley Cousins and colleagues used a multi-phase empirical process to develop and validate a set of principles to guide collaborative approaches to evaluation. This book outlines the principles that the team developed. The case studies that are then used to demonstrate how these principles have been applied draw on programs globally in education, health, and community development. The text 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.