The Organization of European Security Governance investigates what impact the changing nature of security challenges has had on the organization of security governance in Europe. As the most pervasive security challenges today are difficult to classify as either internal or external, the traditional divide between domestic and international security has become blurred. In response, European leaders have emphasized the need to develop comprehensive and horizontal approaches to security in the European Union. But has the European Union been able to deliver a coherent response to this new security environment? In a detailed comparative study of two crucial policy fields - EU counter-terrorism and post-conflict crisis management – the book outlines the scope of the ongoing transformation of Europe's security order, examines its challenges and explains its defects. This important volume will be of interest to students and scholars of Security Studies and European Politics.