These are the proceedings of the Sixth International Workshop on Cooperative Information Agents (CIA 2002), held at the Universidad de Rey Juan Carlos in Madrid, Spain, September 18¿20, 2002. It was colocated with the Third Int- national Workshop on Engineering Societies in the Agents World (ESAW 2002). Since 1997 the annual CIA workshop series has aimed to provide an open forum for all parties interested in the research and development of intelligent infor- tion agents for the Internet and Web. Each event in this renowned series attempts to capture the intrinsic interdisciplinary nature of this research area by calling for contributions from di?erent research communities, and