This book constitutes the refereed proceedings of the 4th IFIP/IEEE International Conference on the Management of Multimedia Networks and Services, MMNS 2001, held in Chicago, IL, USA, in October/November 2001. The 23 revised full papers and six short papers presented were carefully reviewed and selected from a total of 106 submissions. The papers are organized in topical sections on the management of multimedia streaming, resource management in wireless multimedia, QoS management on the Internet, fault management on the Internet, agents for multimedia management, and multimedia service management.