One of the central issues in modern linguistics has been the relationship between syntax and semantics. Within the framework of generative grammar, established by Chomsky in the early 1960s, it has been assumed that syntax is distinct from, and independent of, semantics. This premise has been challenged recently by Chomsky himself; he now proposes semantics, and in particular thematic roles, as the basis for generating syntactic structures.Yael Ravin argues that thematic roles are not valid semantic entities, and that syntax and semantics are indeed autonomous and independent of one another. She advocates a Decompositional approach to lexical semantics, in the spirit of Katz's semantic theory. In the course of her argument she discusses theoretical issues such as indeterminacy and ambiguity, lexical configuration rules, and lexical projection, and analyses the semantic content of event concepts such as causation, action, and change.