The ''Theory of Communicative Action'' of Jurgen Habermas found intern
ational resonance in philosophy and sociology. Controversial points in
this conception are the formal-pragmatic theory of meaning as a found
ation of a sociological theory of action, the structural model of soci
etal rationalization and the explantion of the structure of modern soc
ieties with a theory of differentiation. Above all his criticism on T.
Parsons - Parsons sociology can not explain social pathologies - is d
isputed. This essay examines Habermas formal-pragmatic theory of meani
ng, and the differentiation theory of modern societies - following R.
Munch - and his criticism on Parsons and argues that Hobbes solution o
f the problem of order has an evolutionary significance and that the f
oundation of a theory of social action has to differentiate between th
e theory of meaning of language behaviour and the systematization of t
he structure of social action.