This book constitutes the refereed proceedings of the 9th International Workshop on Quality of Service, IWQoS 2001, held in Karlsruhe, Germany, in June 2001. abstracts of invited contributions were carefully reviewed and selected from a total of close to 150 submissions. systems QoS, routing, TCP related issues, wireless and mobile networking, aggregation and active networks based QoS, scheduling and dropping, and scheduling and admission control.

This volume constitutes the refereed proceedings of the International Conference on Architecture of Computing Systems, ARCS 2002, held in Karlsruhe, Germany, in April 2002. The 18 revised full papers presented were carefully reviewed and selected from 42 submissions. The papers are organized in topical sections on context-aware systems, system aspects, networking, processor architecture, and middleware and verification.