Professor Rex’s controversial book concerns not only those who are professional sociologists but all thinking people who live in the modern world. One of the objects of sociology is to give ‘power to the people’, to make a contribution to the understanding of political problems. Rex writes from a deep conviction that sociology is a subject whose insights should be made available to the great mass of the people, so that they may liberate themselves from the mystification of social reality that is continually and routinely presented to them through the media, by those who exercise power and by those who have influence. The book is dedicated to St Augustine and Franz Fanon, both of whom, Rex points out, were conscious of living in an age which was embarking on a new barbarism, but had the courage to use their intellects to help understand the possibility of a better future. Rex continues in this tradition, and his main preoccupations are reflected in the present book. It includes a discussion of the problem of social knowledge, an analysis of the basic problems of theory building, and, with the aid of concepts derived from Max Weber, an attempt to understand the major problems of the first, second and third worlds. The author also looks at social structures and moral perspectives, and discusses the vocation of a sociologist in a collapsing civilisation. The book is certain to stimulate debate, both in sociological and political fields and more generally, and is also a serious contribution to the discussion of the methodology and purposes of sociology.