This study focuses on the relation of syntactic and semantic structure. It investigates the notion that within generative grammar there is a level of linguistic representation Logical Form. Its main assumption is that this is a level of phrase structure representation, derived by transformational operations from S-structure, and over which formal semantic interpretations are defined.The book explores Logical Form by focusing primarily on quantificational phenomena and on how their explicit syntactic representation interacts with various syntactic and semantic properties. Among the topics discussed are the interactions of wh and quantified phrases, bound variable anaphora, branching quantifiers, extraposition and multiple interrogation.Logical Form contains several technical innovations: the notion that LF-movement closely approximates "Move alpha," a new approach to characterizing quantifier scope, which makes central use of the notion of "government," a novel interpretation of the relation of syntactic nodes and categorical projections, and an application of path theory to the syntactic structure of Logical Form.Robert May is Assistant Professor of Linguistics, Barnard College, Columbia University. Logical Form is Linguistic Inquiry Monograph 12.