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PrefaceAlthough highly intelligent and robust robotic systems have been required in various fields such as flexible manufacturing processes and maintenance tasks in nuclear plants, sufficient functionalityhas not yet been realized with currently available technologies in spite of the efforts to develop intelligent systems supported by robots. Instead of research oriented to single sophisticated robots, distributed autonomous robotic systems (DARS) recently have attracted the attention of many researchers as a new approach to realize robust and intelligent robotic systems. DARS are systems composed of multiple autonomous units such as modules, cells, processors, agents, and robots. Combination or cooperative operation of multiple autonomous units is expected to lead to desirable features such as flexibility, fault tolerance, and efficiency. The concept of DARS was strongly inspired by biological systems, which have characteristics of autonomous and decentralized systems, self-organizing systems, multi-agent systems, and emergent systems. DARS require a broad area of interdisciplinary technologies related not only to robotics and computer engineering (especially distributed artificial intelligence and artificial life), but also to biology and psychology. Reflecting the trends of DARS accelerated by rapid progress in computer and network (communication) technologies, the First and Second International Symposium on Distributed Autonomous Robotic Systems (DARS '92 and DARS '94) were held at the Institute of Physical and Chemical Research (RIKEN), Saitama, Japan, in September 1992 and July 1994. The first DARS book, published in December 1994 by Springer-Verlag, Tokyo, included papers presented at DARS '94. On the occasion of the Third International Symposium on DARS (DARS '96), also held at RIKEN in October 1996, the present book is published as the second volume in the DARS series as the proceedings of DARS '96, with selected papers from the symposium. Two papers presented as invited speeches in the symposium, "Trends and Perspective of Researches on Control System Theory" by Prof. Masami Ito (RIKEN, Japan) and "Collective Intelligence in Natural and Artificial Systems" by Prof. Jean-Louis Deneubourg (Universire Libre de Bruxelles, Belgium), are also included in this volume.v VI We proudly recommend this book for its coverage of broad technological aspects (system design, modeling, simulation, and operation) and various technical issues (sensing, pla...