Concurrency control is one of the most important and challenging issues in designing and implementing synchronized collaborative systems. Due to the complexity of collaborative design, the concurrency control in synchronized collaborative CAD systems is much more difficult. In this paper, the specific definitions of the concurrency conflict and intention preservation in the feature-based collaborative design are given. An approach to detecting the defined concurrency conflicts is also presented. Base on them, a prototype system of synchronized collaborative CAD is implemented.

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