A grammar determined by a linguistic theory (given data) constitutes a hypothesis concerning the speaker-hearer's knowledge of his language and is to be confirmed in terms of empirical evidence drawn, ultimately, from investigation of the linguistic intuitions of the language-user (which might, in principle, be analyzed in terms of operational tests; cf. [sections]12-15, below). The general theory, now regarded as an explanatory theory, is likewise to be understood as a psychological theory that attempts to characterize the innate human 'language faculty," and that can be tested in terms of its consequences in particular languages. (Chomsky 1955/1975: 37)

Chomsky, N., 1955/1975. The Logical Structure of Linguistic Theory. New York: Plenum Press.