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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.

Quote by Talcott Parsons about question

The system becomes logically closed when each of the logical implications which can be derived from any one proposition within the system finds its statement in another proposition in the same system.

Quote by Talcott Parsons

Now obviously the propositions of the system have reference to matters of empirical fact, if they did not, they could have no claim to be called scientific.

Quote by Talcott Parsons