A comprehensive guide to current thinking in political philosophy, this book focuses especially on normative issues. The first part consists of a series of extended essays on the contribution that a number of different disciplines - economics, history, legal studies, political science, sociology, and philosophy itself - have made, and continue to make, to current debates. Analyses of political ideologies form a separate section, followed by discussions of major concepts ranging from virtue and equality to sociobiology and environmentalism that form the subject-matter of philosophical debate. In addition, a detailed and carefully structured index reinforces the reference value of the book. Overall, the exceptionally broad range of perspectives offered by the Companion will be of great value to students and scholars in many areas, within and outside philosophy.