This book constitutes the refereed proceedings of the First International Workshop on Quality of Future Internet Services, QofIS 2000, organized by COST Action 263 in Berlin, Germany in September 2000. The 28 revised full papers presented were carefully reviewed and selected from more than 70 submissions. The book offers topical sections on queueing and scheduling; TCP, flow and congestion control; end-to-end; traffic engineering and QoS routing; QoS measurements and measurement based on QoS mechanisms; fairness; adaptation; traffic classes and charging; and resource utilization and performance.