Updated in light of current international events and ongoing debates in the subject, this highly readable and systematic introduction to the principal theories of international relations combines incisive and original analysis with a clear and accessible writing style. NEW TO THIS EDITION * Expands coverage of Social Constructivism in Chapter 6 * Links Chapter 10: Key Issues in Contemporary IR, more closely with the theoretical chapters * Supported by a revised and expanded Companion Website (www.oup.com/uk/orc/bin/9780199548842) containing case studies, review questions, weblinks to theoretical debates (as well as links to information on world situations in specific geographical location), a flashcard glossary, and boxes and figures from the text