"The grammar of a language is a complex system with many and varied interconnections between its parts. In order to develop one part of grammar thoroughly, it is often useful, or even necessary, to have some picture of the character of a completed system. Once again, I think that the notion that syntactic theory must await the solution of problems of phonology and morphology is completely untenable whether or not one is concerned with the problem of discovery procedures, but I think it has been nurtured by a faulty analogy between the order of development of linguistic theory and the presumed order of operations in discovery of grammatical structure."