This issue explores the potential role of Appreciative Inquiry, a process that searches for what is best in people and organizations, in evaluation. Contributors examine Appreciative Inquiry's approach and impact on the use of evaluation processes and findings, the contextual factors or conditions that make its use in evaluation appropriate, and the challenges of using it. Chapters also provide an overview of Appreciative Inquiry and how it fits within the landscape of evaluation practice, four case studies, and commentary and critique of specific points in this issue, as well as broader consideration of the possibilities that Appreciative Inquiry offers to evaluation practice. By offering evaluators an approach and method for discovering and building on the positive aspects of a program, Appreciative Inquiry is an valuable resource for evaluators. This issue is an indispensable guide to that resource.