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In linguistics, X-bar theory is a model of phrase-structure grammar and a theory of syntactic category formation[1] that was first proposed by Noam Chomsky in 1970[2] reformulating the ideas of Zellig Harris (1951[3]), and further developed by Ray Jackendoff (1974,[4] 1977a,[5] 1977b[6]), along the lines of the theory of generative grammar put forth in the 1950s by Chomsky.[7][8] It attempts to capture the structure of phrasal categories with a single uniform structure called the X-bar schema, basing itself on the assumption that any phrase in natural language is an XP (X phrase) that is headed by a given syntactic category X. It played a significant role in resolving issues that phrase structure rules had, representative of which is the proliferation of grammatical rules, which is against the thesis of generative grammar.
X-bar theory was incorporated into both transformational and nontransformational theories of syntax, including government and binding theory (GB), generalized phrase structure grammar (GPSG), lexical-functional grammar (LFG), and head-driven phrase structure grammar (HPSG).[9] Although recent work in the minimalist program has largely abandoned X-bar schemata in favor of bare phrase structure approaches, the theory's central assumptions are still valid in different forms and terms in many theories of minimalist syntax.