The fourth edition of this successful textbook has been updated in light of current international events and ongoing debates in the subject. It is a highly readable book that provides a systematic introduction to the principal theories in international relations, combining incisive and original analysis with a clear and accessible writing style. Introduction to International Relations is the ideal textbook for all students taking an introductory course in international relations or international relations theory. The book focuses on the main theoretical traditions - realism, liberalism, international society, and theories of international political economy. The fourth edition includes expanded coverage of social constructivism and the chapter on key issues in contemporary IR is closely linked with the theoretical chapters. Emphasis is placed on the relationship between IR theory and IR practice. The authors carefully explain how particular theories organize and shape our view of the world ensuring that students receive a blended view of theory and practice. The book is supported by an online resource centre. Student resources: Case studies Review questions Web links to theoretical debates Flashcard glossary Lecturer resources: Boxes from the text including text, figures and tables