This book provides a critical analysis of the changing discourse and practice of post-conflict security - promoting interventions since the Cold War, such as disarmament, demobilization and reintegration (DDR), and security-sector reform (SSR). Although the international aid and security sectors exhibit an expanding appetite for peace-support operations in the 21st Century, the effectiveness of such interventions are largely untested. This book aims to fill this evidentiary gap and issues a challenge to 'conventional' approaches to security promotion as currently conceived by military and peace-keeping forces, drawing on cutting-edge statistical and qualitative findings from war-torn areas including Afghanistan, Timor Leste, Sudan, Uganda, Colombia and Haiti.By focusing on specific cases where the United Nations and others have sought to contain the (presumed) sources of post-conflict violence and insecurity, it lays out a new research agenda for measuring success or failure. This book will be of much interest to students of peacebuilding, peacekeeping, conflict resolution, conflict and development and security studies in general.