The annual Going Romance conference is the major European discussion forum for theoretically relevant research on Romance languages where current ideas about language in general and about Romance languages in particular are tested. Starting with the thirteenth conference held in 1999, volumes with selected papers of the conferences are published under the title Romance Languages and Linguistic Theory, This is the fifth such volume, containing a selection of papers that have been presented at the seventeenth Going Romance conference, held at the Radboud University Nijmegen (The Netherlands) from 20-22 November 2003. The three-day program included a workshop on 'Diachronic Phonology'. The present volume contains a broad range of articles dealing not only with syntax and phonology, but also with morphology, semantics and acquisition of the Romance languages.