The most comprehensive and inclusive survey and synthesis available on the subject, this book makes the rich, ever-evolving complexity of IR theories accessible and fascinating for readers. Widely acclaimed for its vast scope, engaging writing style, and abundant citation of reference sources, the Fifth Edition has been thoroughly revised and updated to reflect the various paradigmatic and theoretical debates that have emerged since the end of the Cold War.The book incorporates the most significant current writings on all areas of theory from neorealism, neoliberal theory, postmodernism, and contructivism to globalization, ethnic conflict, international terrorism, and new approaches to deterrence amidst proliferation of Weapons of Mass Destruction technologies.For those interested in International Relations.