“The hypothesis may be put forward, to be tested by the s subsequent investigation, that this development has been in large part a matter of the reciprocal interaction of new factual insights and knowledge on the one hand with changes in the theoretical system on the other.”
Source : Talcott Parsons, Peter Hamilton (1985). “Readings from Talcott Parsons”, Chichester [West Sussex] : E. Horwood ; London ; New York : Tavistock Publications