摘要：The aim of this work is to take into account the sociological meaning of several social processes such as differentiation, rationalization and historical temporality which gave us an adequate account on the making of modern societies. In the analysis of the increase in social complexity will be thematized the perspectives of Durkheim, Weber, Castoriadis and Touraine. And this paper to inquire the sociological fruitfulness of a conception of a two level society: on the one hand, the version "life world"/system, represented by J. Habermas and, on the other hand, the version system/environment, represented by N. Luhmann.
