The American Political Science Association has developed a broad description of the discipline. Political Science, it says, is the study of governments, public policies and political processes, systems, and political behavior. The profession s sub-fields include American politics, political philosophy, comparative politics, international relations and a host of related fields such as policy studies, political geography, political economy, and studies of particular countries or geographic areas. Political scientists use a variety of approaches to examine the process, systems and political dynamics of all countries and regions of the world.