I had helped work out a lot of the early details of Chomsky's theory of grammar. Noam claimed then — and still does, so far as I can tell — that syntax is independent of meaning, context, background knowledge, memory, cognitive processing, communicative intent, and every aspect of the body...In working through the details of his early theory, I found quite a few cases where semantics, context, and other such factors entered into rules governing the syntactic occurrences of phrases and morphemes. I came up with the beginnings of an alternative theory in 1963 and, along with wonderful collaborators like "Haj" Ross and Jim McCawley, developed it through the sixties.[5]