Sociological theories contributions to the ontological question. The cases of Luhmann, Habermas y Latour

In this paper are discussed the contributions of the contemporary sociological theory to the philosophical and scientical question of Ontology, for this purpose are compared the ontological assumptions elaborated for the General Social Systems Theory by Niklas Luhmann, Communicative Action Theory by Jürgen Habermas and Actor-Network Theory by Bruno Latour