This book constitutes the refereed proceedings of the 6th International Workshop on Cooperative Information Agents, CIA 2002, held in Madrid, Spain, in September 2002. The revised papers - 15 full and 8 short - presented together with 4 invited contributions, were carefully reviewed and selected from 59 submissions. The papers are organized in topical sections on information agents for mobile computing environments, interaction and negotiation, information gathering and collaborative filtering, agent-based information and knowledge management, agent communication and cooperation, and information agent mobility.