"The Evolution of International Security Studies is a more than a comprehensive survey of a vast and contentious body of thought; it is also a lucid and insightful analysis of the forces that have shaped the field and the strengths and weaknesses of different approaches. Buzan and Hansen are scrupulously fair-minded and their book is a model of clear and elegant exposition. It will be of enormous value to students and of considerable interest to established scholars as well." Stephen M. Walt, John F. Kennedy School of Government, Harvard University