This long-awaited new edition has been fully updated and revised by the original authors as well as two new members of the author team. Based on many years of active research and teaching it takes the discipline's most difficult aspects and makes them accessible and interesting. Each chapter builds up an understanding of the different ways of looking at the world. The clarity of presentation allows students to rapidly develop a theoretical framework and to apply this knowledge widely as a way of understanding both more advanced theoretical texts and events in world politics. Suitable for first and second year undergraduates studying international relations and international relations theory.