Henry R. Nau’s bestselling book Perspectives on International Relations is admired for its even-handed presentation of realism, liberalism, constructivism, and critical theory―and for expertly applying those perspectives in every chapter. Students focus on the ways the different perspectives shape our understanding of the root causes of historical events and current controversies in world affairs, and learn to think critically about the world’s most urgent issues. In the new fifth edition, updates include the rise of ISIS, new developments in Russia, China and the Middle East, ongoing environmental concerns and more. Instructors will find a new "primer" for students on how to learn to identify the perspectives and levels of analysis in the introduction and chapter one.