"Framed by a new and substantial introductory chapter, the book collects Stefano Guzzini's reference articles and some less well known publications on power, realism and constructivism. By analysing theories and their assumptions, but also theorists following their intellectual paths, his analysis explores the diversity of different schools and moves beyond simple definitions to explore their intrinsic tensions and fallacies. Guzzini's approach to the analysis of power - both within and outside International Relations - provides the common theme of the book through which the theoretical state of the art in IR is re-assessed"-- Provided by publisher.