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This project studied some of the issues associated with collaborative solid modeling (CSM) on the WWW and implemented some possible solutions. The CSM system developed oglers the following facilities for collaborative design:(I) an environment for multiple users to edit a shared solid object on the WWW synchronous! v,(2) representation of alternate versions of a solid by a single CSG tree,(3) support for dif/rerent modes of collaboration among the users. The system was written in JAVA and tested mainly in a UNIX environment.