This volume presents the final results of the CHALLENGE research project (The Changing Landscape of European Liberty and Security) – a five-year project funded by the Sixth Framework Programme of DG Research of the European Commission. The book critically appraises the liberties of citizens and others within the EU, and the different ways in which they are affected by the proliferation of discourses, practices and norms of insecurity enacted in the name of collective and individual safety. It analyses from an interdisciplinary perspective the impacts of new techniques of surveillance and control on the liberty and security of the citizen. The book studies illiberal practices of liberal regimes in the field of security, and the relationship between the internal and external effects of these practices in an increasingly interconnected world, as well as the effects in relation to the place of the EU in world politics.