It may be, then, that the natural general principle that will subsume this case delimits the ultimate standard that determines the accuracy of any proposed grammar. It must be emphasized, once again, that most of the methodological work in modern linguistics cannot be arbitrary in a general convention regarding the forms of the grammar. From C1, it follows that any associated supporting element is necessary to impose an interpretation on a stipulation to place the constructions into these various categories. Note that the fundamental error of regarding functional notions as categorial is to be regarded as the requirement that branching is not tolerated within the dominance scope of a complex symbol. Suppose, for instance, that a case of semigrammaticalness of a different sort raises serious doubts about a corpus of utterance tokens upon which conformity has been defined by the paired utterance test.
see also: WikiPedia -- Chomskybot