In dealing with the evolution of political thought, most historians and social scientists, until recently at least, have tended to view political behavior and the changing patterns of power in society as rational implementations of dynamic ideas. They have accordingly concerned themselves more with the development of abstract philosophical systems than with the social-psychological contexts conditioning this development. To other observers, more Marxian than Hegelian in their outlook, all political ideas are but reflections of the economic interests and class ideologies of the various strata of society. This school therefore probes for the secrets of political and social change, not in the surface phenomena of ideas, but in the progress of technology and in the shifting economic relations of groups and classes within the social hierarchy. Still others, few in number as yet, have adopted Freud as their guide.