However, this assumption is not correct, since most of the methodological work in modern linguistics can be defined in such a way as to impose irrelevant intervening contexts in selectional rules. From C1, it follows that relational information delimits the traditional practice of grammarians. For any transformation which is sufficiently diversified in application to be of any interest, the systematic use of complex symbols is not quite equivalent to nondistinctness in the sense of distinctive feature theory. This suggests that the fundamental error of regarding functional notions as categorial is to be regarded as a descriptive fact. Presumably, the notion of level of grammaticalness does not readily tolerate the ultimate standard that determines the accuracy of any proposed grammar.
see also: WikiPedia -- Chomskybot