Cooperative Information Agents III : Third International Workshop CIA’99 Uppsala Sweden July 31–August 2 1999 Proceedings This book constitutes the refereed proceedings of the Third International Workshop on Cooperative Information Systems CIA99 held in Uppsala Sweden in July August 1999. The 16 revised full papers presented were carefully reviewed and selected from a total of 46 submissions. Also included are ten invited contributions by leading experts. The volume is divided in sections on information discovery and management on the Internet; information agents on the Internet prototypes systems and applications; communication and collaboration mobile information agents; rational information agents for electronic business; service mediation and negotiation; and adaptive personal assistance