Aspects of the Theory of Syntax is a book written by American linguist Noam Chomsky, first published in August 1965. It is known in linguistic circles simply as Aspects. Chomsky wrote Aspects to address the various deficiencies found in transformational generative grammar (TGG), a new kind of syntactic theory that he had introduced in the 1950s with the publication of his first book, Syntactic Structures. In Aspects, Chomsky presented a deeper, more extensive reformulation of TGG.