This major collection offers contemporary commentary on one of the most enduring and important works of international theory: Hedley Bull's The Anarchical Society. It brings together leading writers on the English school, and analyzes how Bull's account of order fares in the face of globalization. Following Bull's structure, it considers key concepts, major institutions and alternative approaches to order, and reasserts the enduring insight of Bull's work, while responding to major developments in the theory and practice in international relations.