<P>This revised and updated second edition features over twenty new chapters and offers a wide-ranging collection of cutting-edge essays from leading scholars in the field of Security Studies. </P><P>The field of Security Studies has undergone significant change during the past 20 years, and is now one of the most dynamic sub-disciplines within International Relations. This second edition has been significantly updated to address contemporary and emerging security threats with chapters on organised crime, migration and security, cyber-security, energy security, the Syrian conflict and resilience, amongst many others. Comprising articles by both established and up-and-coming scholars, <EM>The Routledge Handbook of Security Studies</EM> provides a comprehensive overview of the key contemporary topics of research and debate in the field of Security Studies. The volume is divided into four main parts: </P><P>¿ Part I: Theoretical Approaches to Security </P><P>¿ Part II: Security Chall