data management system. However, the asynchronous collaborative design system cannot be satisfied by the users who want to have a face-to-face-like collaboration on networked computer system [2,4]. Synchronous collaborative design system enables collaborators to work in a shared workspace at the same time. Each can receive the feedback information coming from others right after his operation [5,8]. However, product data can not be effectively managed by the system. Besides, at present, most synchronous…
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