This collection deals with central issues in the syntax of clauses and their interfaces with the conceptual-intentional system. The book targets the syntactic properties that have an impact on the interpretation of discourse and temporal dependencies, functional fields including CP, pragmatic markers at the syntax-pragmatic interface, and on the possible parameterization of these properties. The papers in this volume bring to the fore the role of the edges (specifier and adjuncts), heads and projections in the grammar and at the interfaces. They address the question to what extent the relevant configurations at the level of edges, head, and projections determine the syntax/semantic, semantic/pragmatic connections. The contributions clarify the notion of edge and bring evidence that this notion is core to the analysis of various phenomena at the left periphery of clauses and phrases. This volume also discusses functional heads and their projections, particularly insofar as the properties of these heads determine the composition of the CP field, and cases where a CP may or may not be projected.