This work is now widely recognised as one of the founding texts in a new approach to analyzing the links between political power, expertise and the self. This governmentality perspective has had important implications for a range of academic disciplines including criminology, political theory, sociology and psychology and has generated much theoretical innovation and empirical investigation. This second edition adds a new introduction setting out the methodological and conceptual bases of this approach and a new final chapter that considers some of the implications of recent developments in the government of subjectivity.