AI'2004 was held at the University of Western Ontario in London, Ontario from May 17 to May 19, 2004. The conference was held jointly with the Computer and Robot Vision and Graphics Interface conferences. The three conferences attracted more than 200 attendees. Three workshops and a graduate symposium were held in conjunction with the technical sessions. Three preconference workshops were affiliated with AI'2004: The Third Business Agents and the Semantic Web workshop, organized by Harold Boley, Scott Buffett, Bruce Spencer (National Research Council), Ali Ghorbani (University of New Brunswick), and Said Tabet (Macgregor Inc.); the First Agent Meets Robot workshop, organized by Hamada Ghenniwa, (University of Western Ontario), Weiming Shen (National Research Council) and Mohamed Kamel (University of Waterloo); and the First Causality and Causal Discovery workshop, organized by Kamran Karimi (University of Regina).