The advancement of key technologies in communication, such as optical and radio transmission, coding schemes, switching mechanisms etc. , has meant that communication networks are quickly growing to a larger-scale and higher speed than was ever anticipated. In terms of usage, Internet and real-time ap plications are expected to share a significant portion of the bandwidth in the next-generation of communication networks. Therefore, in order to achieve seamless and Quality of Service (QoS)-guaranteed transmission, regardless of source characteristics, extensive research into networking technologies is es sential. For the proper design, development and operation of emerging ideas on networking, further studies on the performance modeling and evaluation of networking are also encouraged. The International Conference on the Performance and QoS of Next Gen eration Networking (P&QNet2000) is being held from November 27 to 29, 2000, in Nagoya, Japan (Seto Campus of Nanzan University). This is the sixth international conference on the performance and other aspects of com munication networks. The conference is held once every three years in Japan (1985 in Tokyo; 1988, 1991, and 1994 in Kyoto; 1997 in Tsukuba). The confer ence is sponsored by the International Federation of Information Processing (IFIP) Working Group (WG) 6. 3 Performance of Communication Systems, 6. 4 High Performance Networking, and 7. 3 Computer System Modelling. Fi nancial supports are given by Commemorative Association for the Japan World Exposition (1970), Support Center for Advanced Telecommunications Technology Research, and Nanzan University.