In May 2010, the Alliance for Peacebuilding in collaboration with the United States Institute of Peace launched the Peacebuilding Evaluation Project. Over the course of a year, the project held a series of four meetings in Washington, DC. The goal of the project was to foster collaboration among funders, implementers, and policymakers to improve evaluation practice in the peacebuilding field. This report is inspired by the deep and far-ranging conversations that took place at the meetings. Its central argument is that whole-of-field approaches designed to address systemic challenges are necessary if the practice of peacebuilding evaluation is to progress.