The end of the Cold War has provoked an explosive increase in theories, concepts, and debates in the discipline of International Relations. There is growing confusion as to what are the important issues and what are the best ways of approaching them. This book is unique in providing asystematic introduction to principal theories in IR, including 'post-positivist' theories which have gained prominence in recent years. The strengths and weaknesses of each theory are critically examined and the main points of contention between the theories are thoroughly discussed. The textcontains a large number of empirical illustrations which demonstrate the link between theory and actual events.The book provides a rapid entry into the discipline of IR. Each chapter begins with a brief summary, and ends with a list of key points, study questions, and a guide to further reading. Jackson and Sorensen offer the ideal introduction to this important subject, enabling students to master IR as adiscipline rather than merely study current events.