This book constitutes the thoroughly refereed and extended post-proceedings of the ERCIM/CoLogNet International Workshop on Constraint Satisfaction and Constraint Logic Programming, CSCLP 2004, held in Lausanne, Switzerland in June 2004. Besides papers taken from the workshop, others are submitted in response to an open call for papers after the workshop. The 15 revised full papers were carefully reviewed and selected from 30 submissions. The papers are organized in topical sections on constraint propagation, constraint search, and applications.