Generative grammar is a linguistic theory that regards grammar as a system of rules that generates exactly those combinations of words that form grammatical sentences in a given language. Noam Chomsky first used the term in relation to the theoretical linguistics of grammar that he developed in the late 1950s.[1] Linguists who follow the generative approach have been called generativists. The generative school has focused on the study of syntax and addressed other aspects of a language's structure, including morphology and phonology.