Description:This book constitutes the thoroughly refereed post-proceedings of the Joint ERCIM/CoLogNET International Workshop on Constraint Solving and Constraint Logic Programming, CSCLP 2003 held in Budapest, Hungary in June/July 2003. The 15 revised full papers presented were carefully reviewed and selected for inclusion in the book. The papers are organized in Topical sections on constraint solving, soft constraints, language issues, and applications.