Some people considers The Niklas Luhmanns Theory of Social System like
a recent version of the Talcott Parsons Theory. In this paper, We are going
to demonstrate that is not true. The Luhmanns Theory is more dynamical in
comparison with the structural character of the Parsons approach because
included some conceptual aspects of the recent theory of complexity (von
Foerster, Spencer Brown). This analysis was founded in the study of the
uses of the two terms: «system» and «social system».