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RoboCup is an initiative designed to promote the full integration of AI and robotics research. Following the success of the first RoboCup in 1997 at Nagoya (Kitano 1998; Noda et al. 1998) and the second RoboCup in Paris in 1998 (Asada et al. 2000; Asada and Kitano 1999), the Third Robot World Cup Soccer Games and Conferences, RoboCup-99, were held in Stockholm from 27 July to 4 August 1999 in conjunction with the Sixteenth International Joint Conference on Artificial Intelligence (IJCAI-99). There were four different leagues: (1) the simulation league, (2) the smallsize real robot league, (3) the middle-size real robot league, and (4) the Sony legged robot league. RoboCup-2000, the Fourth Robot World Cup Soccer Games and Conferences, will take place in Melbourne, Australia, in August 2000. It was organized by Linköping University with the cooperation of Stockholm University, and it was sponsored by Sony Corporation, Sun Microsystems, Futurniture, First Hotel, The Foundation for Knowledge and Competence Development, The Swedish Council for Planning and Coordination of Research, The Swedish Foundation for Strategic Research, the Swedish National Board for Industrial and Technical Development, and the Wallenberg Laboratory for Research on Information Technology and Autonomous Systems.