The act of violence of 9/11 changed the global security agenda, catapulting terrorism to the top of the agenda. Weapons of mass destruction grabbed public interest and controlling the free movement of people became a national security priority.

In this volume, Jef Huysmans critically engages with theoretical developments in international relations and security studies to develop a conceptual framework for studying security. He argues that security policies and responses do not appear out of the blue, but are part of a continuous and gradual process, pre-structured by previous...