When will we ever learn ... to change policy: current state of impact evaluation

This article explores the recent past, current status and future of impact evaluation (IE) of development interventions. We both review the existing literature and conduct key informant interviews with Evaluators and Implementers. We provide an overview of the field of IE of development interventions, both in terms of conducting IE studies and in terms of using IEs for policy change. We also examine the challenges for both Evaluators and Implementers in combining IE research with efforts to change policy.