Anthropology Cultural evolution-the development of one or more cultures from simpler to more complex forms. The subject may be viewed as a unilinear phenomenon that describes the evolution of human behavior as a whole, or it may be viewed as a multilinear phenomenon, in which case it describes the evolution of individual cultures or societies (or of given parts of a culture or society). Structural functionalism is a sociological paradigm which addresses what social functions various elements of the social system perform in regard to the entire system. Social structures are stressed and placed at the center of analysis, and social functions are deduced from these structures. Conflict theory is a social theory which emphasizes a person's or group's ability to exercise influence and control over others, thereby affecting social order. It posits that individuals and groups struggle to maximize their benefits, inevitably contributing to social changes such as innovations in politics and outright revolutions. Conflict theory examines class conflict, such as that between the proletariat and bourgeoisie, and contrasts ideologies such as capitalism and socialism. It proposes that continual struggles exist among all different aspects of a particular society. These struggles do not always involve physical violence; they can be underlying efforts by each group or individual within a society to maximize its benefits. Symbolic interactions are a major sociological perspective that is influential in many areas of the discipline. It is particularly important in micro sociology and social psychology. International law the term "international law" can refer to three distinct legal disciplines: Public international law, which governs the relationship between states and international organizations. it includes the following specific legal field such as the law of treaty, law of sea, international criminal law and the international humanitarian law. Private international law, or conflict of laws, which addresses the questions of (1) in which legal jurisdiction may a case be heard; and (2) the law concerning which jurisdiction(s) apply to the issues in the case. Supranational law or the law of supranational organizations, which concerns at present regional agreements where the special distinguishing quality is that laws of nation states are held inapplicable when conflicting with a supranational legal system. The two traditional branches of the field are: jus gentium — law of nations jus inter gentes — agreements among nations.