The theoretical domain of investigation of this volume is the nature of the syntax-phonology interface. The empirical domain of investigation is cliticization in South Slavic. The volume also examines several phenomena that raise theoretical issues related to those involved in South Slavic cliticization, namely, multiple wh-fronting in Slavic and Romanian, Germanic V-2, object shift and stylistic fronting in Scandinavian, and negation in Romance. The central theoretical questions considered in the volume are how syntax and phonology interact with each other and whether PF can affect word order. It is argued that PF does affect word order, but not through actual PF movement. The volume makes new proposals concerning the structural representation of clitics and the nature of clitic clustering. It also provides an account of the second position effect and teases apart the role of syntax and phonology in cliticization and the second position phenomenon.