Sidgwick says that it is always useful for the proper understanding of any subject of inquiry to establish its relationship with other sciences and to see clearly what elements of its reasonings it has to take from thein and what in its turn it may claim to give them. Political Science is deeply related to all other social sciences, because knowledge that is gained about any phase of human behavior and attitudes, because knowledge that is gained about any phase of human behavior and attitudes, about the institutions that men build, or the ideas to which they respond in the mass, cannot fail to be of be use in similar fields of inquiry. Each social science-sociology, anthropology, history economics, ethics, psychology, jurisprudence, geography and political science-supplements and fortifies the rest. If we divide them into different sciences, they are distinctions within a unity as all aim at the study of man in society. All are inter-dependent and inter-related. Each contributes importantly to the advancement of the other. Gunnar Heckscher succinctly says, “We cannot think of economics, sociology, political science, cultural anthropology. Any more than of chemistry, mechanics, biology, etc., as a group of aelf-contained units, each clearly defined and independent of the others. We must rather think of science as a field of study which for practical purposes we have to divide between us, bus which in principle is a whole, not a group of separate parts.” During recent times there has been an appreciable extension of the dimensions of Political Science, due to increase in interdisciplinary approach, as an aid to complete knowledge of an astonishing complex phenomenon-man’s organized political life.