Recent years have seen a number of high-profile events seeking to further understanding of violent extremism and inform the policy and practice of Preventing Violent Extremism (PVE), including the Oslo I and II Global Conferences on PVE, organized by UNDP. There has, however, been less time and space given to discussions on measuring impact in this complex field. To explore best practice and potential solutions to the conceptual and practical challenges of measuring and monitoring prevention, UNDP convened researchers and practitioners at the Amman Forum on Measuring, Monitoring and Assessing PVE.