Since the publication of its first edition, this textbook has been the prime choice of teachers and students alike, due to its clear and detailed explanation of the basic principles of the multilateral trading system and the law of the World Trade Organization (WTO). The fifth edition continues to explore the institutional and substantive law of the WTO. It has been updated to incorporate all new developments in the WTO's ever-growing body of case law. Moreover, each chapter includes a 'Further Readings' section to encourage and facilitate research and discussion on the topics addressed. As in previous editions, each chapter also features a summary to reinforce learning. Questions, assignments, and exercises on WTO law and policy are contained in an online supplement, updated regularly. This textbook is an essential tool for all WTO law students and will also serve as a practitioner's introductory guide to the WTO.