Political science is the scientific study of politics. It is a social science dealing with systems of governance and power, and the analysis of political activities, political thoughts, political behavior, and associated constitutions and laws. Modern political science can generally be divided into the three sub disciplines of comparative politics, international relations, and political theory. Other notable sub disciplines are public policy and administration, domestic politics and government (often studied within comparative politics), as well as political economy and political methodology, Furthermore, political science is related to, and draws upon, the fields of economics, law, sociology, history, philosophy, human geography, journalism, political anthropology, and social policy. Political science is methodologically diverse and appropriates many methods originating in psychology, social research and cognitive neuroscience. Approaches include positivism, interpretivism, rational choice theory, behaviourism, structuralism, post-structuralism, realism, institutionalism, and pluralism. Political science, as one of the social sciences, uses methods and techniques that relate to the kinds of inquiries sought: primary sources, such as historical documents and official records, secondary sources such as scholarly journal articles, survey research, statistical analysis, case studies, experimental research, and model building.