That is, a system starts with a group of interrelated propositions which involve reference to empirical observations within the logical framework of the propositions in question.

The main concern of the study is with the outline of a theoretical system. Its minor variations from writer to writer are not a matter of concern to this analysis.

The functions of the family in a highly differentiated society are not to be interpreted as functions directly on behalf of the society, but on behalf of personality.

Talcott Parsons Quotes