This volume provides an authoritative overview of Government and Binding Theory, and -- in crucial new papers by Noam Chomsky and Alec Marantz -- of the subsequent development of the Minimalist Program. Written by a group of internationally respected researchers, each chapter is focused on an individual module of the theory. Articles describe the current development of and state of work on a particular topic; its place within the architecture of the GB approach to linguistic structure; and the prospects and need for change within the module.