Yiming Ye is a Ph.D candidate at Department of Computer Science, University of Toronto and a Research Fellow student at IBM Canada Centre for Advanced Studies. He has papers in the areas of Internet agent and WWW, computer vision and image processing, robotics, computational geometry, machine translation, computational complexity, and knowledge based systems been published in journals and conference proceedings such as: Proceedings of CASCON96, Proceedings of Second International Conference on Multiagent Systems (ICMAS96), Proceedings of the International Symposium on Intelligent Robotic Systems (SIRS96), Proceedings of 1995 IEEE International Symposium for Computer Vision (ISCV95), Proceedings of the 4th International Symposium on Artificial Intelligence and Mathematics (AIM95), Proceedings of the Second Asian Symposium on Computer Mathematics (ASCM96), Proceedings of the IJCAI Workshop for handicapped Children, Proceedings of 1990 ACM Eighteenth Annual Computer Science Conference, and Science in China etc. His current research interests are multimedia, image processing, computer vision, robotics, Internet agent, and multiagent system, etc. He can be reached at yiming@vis.toronto.edu. John K. Tsotsos is a professor of Department of Computer Science, University of Toronto and a Fellow of Canadian Institute of Advanced Studies. He can be reached at tsotsos@vis.toronto.edu. Karen Bennet is a Principal Investigator and Operational Manager for Center for Advanced Studies, IBM Canada. She can be reached at bennet@vnet.ibm.com.