 Both policy analysis and political economy pursue projects substantially different from the philosophical ones. Policy analysis seeks to understand how legal rules influence behavior; political economy seeks to understand the ways in which society structures its political, economic, and legal institutions. These projects suggest a social scientific concept of law rather than a doctrinal or taxonomic one. A social-scientific concept of law would help us understand the social world in general, the emergence and persistence of social groups over time and the causes and consequences of different governmental structures. Political economy and policy analysis, or a general sociology, then seek to answer the question: How do we differentiate the structures of social governance in order to understand social phenomena? 