We are delighted to present the proceedings of the 7th IFIP/IEEE International Conference on Management of Multimedia Networks & Services (MMNS). The MMNS 2004 conference was held in San Diego, California, USA on October 4 6,2004.Asinpreviousyears, theconferencebroughttogether aninternational audience of researchers and scientists from industry and academia who are - searching and developing state-of-the-art management systems, while creating a public venue for results dissemination and intellectual collaboration. This year marked a challenging chapter in the advancement of management s- tems...