brings together the collected essays of Kenneth N. Waltz, one of the most important and influential thinkers of international relations in the second half of the twentieth century. His books and are classics of international relations theory and gave birth to the school of thought known as neo-realism or structural realism, out of which many of the current crop of realist scholars and thinkers has emerged. Waltz frames these seminal pieces in his theoretical development by explaining the context in which they were written and, building on the broader aims of these theories, explains the elusive nature of power balancing in today’s international system. It is an essential volume for both students and scholars.