"Conditions on Transformations" is an article on linguistics by Noam Chomsky, published in 1973.^[1] In it, Chomsky attempted to formulate constraints on transformational rules used in Transformational Generative Grammar (TGG), a syntactic theory that Chomsky first proposed in the 1950s. These constraints, or "conditions", helped decrease the number of possible generative grammars, with a goal to account for the process of language acquisition in children.

Chomsky's attempt to greatly constrain the power of transformational rules found a common ground with a new generation of generative linguists in Europe, as evidenced by the quote below:^[2]

In our opinion, generative linguistics acquired a new momentum in Europe after Chomsky's Conditions on Transformations (1973). This epoch-making paper shifted the interest of linguists from rather arbitrary rules to simple well-constrained rules operating under general conditions. A significant number of members of GLOW have found their common ground in the research programme that grew out of Conditions.