On the other hand, any associated supporting element does not affect the structure of an abstract underlying order. Presumably, this selectionally introduced contextual feature delimits the ultimate standard that determines the accuracy of any proposed grammar. For one thing, the notion of level of grammaticalness is necessary to impose an interpretation on a corpus of utterance tokens upon which conformity has been defined by the paired utterance test. On our assumptions, the natural general principle that will subsume this case is not to be considered in determining the strong generative capacity of the theory. Summarizing, then, we assume that the speaker-hearer's linguistic intuition is to be regarded as the traditional practice of grammarians.
see also: WikiPedia -- Chomskybot