The Rendezvous architecture and language for constructing multiuser applications
ACM Transactions on Computer-Human Interaction (TOCHI)
Real time groupware as a distributed system: concurrency control and its effect on the interface
CSCW '94 Proceedings of the 1994 ACM conference on Computer supported cooperative work
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Collaborative systems provide a rich but potentially chaotic environment for their users. During the collaborative design process, when different users share a common object, concurrency control is necessary to keep the shared object consistent. In this paper, we have developed a model for supporting concurrency control in CSCW applications. We also include version control, allowing versions of both the design entities and their relationships. Consistency in collaborative design is important: the use of the RAISE formal method provides confidence that the transaction mechanism fulfils the consistency requirements. We also generate a prototype from the specification, with a graphical output to show the structure of the design, the entities available, and who is currently locking what.