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.
It is that of increasing knowledge of empirical fact intimately combined with changing interpretations of this body of fact – hence changing general statements about it – and not least a changing a structure of the theoretical system.
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The implications of these considerations justify the statement that all empirically verifiable knowledge even the commonsense knowledge of everyday life – involves implicitly if not explicitly systematic theory in this sense.