Syntax in linguistics is the study of how abstract units of language such as words acceptably combine into larger grammatical structures such as phrases and sentences. Syntacticians attempt to define rules which describe the formation such structures and disallow others, either in the grammar of a specific language, or in all languages. Since the publication of Noam Chomsky's book Syntactic Structures in 1957, much research on syntax in the modern discipline of linguistics has been within the frameworks of generative linguistics theories such as minimalist syntax, or has emerged in competition to those theories.