There is currently much discussion of Quality of Service (QoS) measurements at the network level of real-time multimedia services. The presence of a network brings up a number of issues. Our researches aim at investigating and clarifying the network issues and constructing more robust hap tic interaction system to realize network-based shared virtual environments (Net-SVEs) under realistic network conditions -- from the end-user's point of view. For this purpose, we have designed some experiments to investigate the influence of network delay on multiuser haptic collaboration system through subjective and objective assessment by users. This paper shows the results of the relation between QoS and network delay on haptic Net-VEs.
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