Security Studies is the most comprehensive textbook available on security studies. Comprehensively revised for the new edition including new chapters on Polarity, Culture, Intelligence, and the Academic and Policy Worlds, it continues to give students a detailed overview of the major theoretical approaches, key themes and most significant issues within security studies. * Part 1 explores the main theoretical approaches currently used within the field from realism to international political sociology. * Part 2 explains the central concepts underpinning contemporary debates from the security dilemma to terrorism. * Part 3 presents an overview of the institutional security architecture currently influencing world politics using international, regional and global levels of analysis. * Part 4 examines some of the key contemporary challenges to global security from the arms trade to energy security. * Part 5 discusses the future of security. Security Studies provides a valuable teaching tool for undergraduates and MA students by collecting these related strands of the field together into a single coherent textbook.