The fully revised and updated new edition of this textbook continues to provide the most accessible overview of the main approaches in the study of public policy. It explains the most common and widely used frameworks in the study of policy analysis: institutionalism; network theory; socioeconomic theories; rational choice; and, ideas-based. The book explains each one, offers constructive criticisms and explores their claims in the light of American, British and European examples. Peter John argues that no one approach offers a comprehensive explanation of public policy, so a combination is needed. After reviewing some recent attempts at synthesis, he advocates an evolutionary approach which is best able to account for the importance of ideas and interests in the policy process. Combining both a clear summary of debates in public policy and a new and original approach to the subject, this book remains essential reading for students of public policy and policy analysis.