Syntactic description and theoretical syntax are central concerns in linguistics. For thirty years, the search for a single formal model of syntax has been the central task in the field; many theories have been proposed, some discarded, none universally adopted, and the problem continues to challenge linguists. This collection gives a full and fascinating picture of the evolution of linguists' attempts to wrestle with syntax. The comprehensive inclusion of less popular theories alongside more current ones provides the researcher with the context and perspectives necessary to appreciate why some avenues have been pursued, while others have not. This is valuable for the development both of the more generally accepted approaches, and of others now being revived or introduced.