Lucent Technologies Inc.

Du Li

Lalita Jategaonkar Jagadeesan

Patrice Ismael Godefroid

James David Herbsleb

Presence awareness initiatives are implemented in a collaborative system that enables a user to set presence awareness policies, and that provides a reasonably high assurance that the system will correctly implement those policies. Specifically, the collaborative presence awareness system is such as to enable users to specify complex presence awareness policies. The presence awareness system is also such as to have been verified by employing systematic state-space exploration tools to establish a high level of assurance that the presence awareness system has the capability to implement correctly, substantially all possible presence awareness policies. Further, in accordance with another aspect of the invention, the presence awareness policy specifications are modular relative to the rest of the presence awareness system, and can be modified without having to modify computational modules or user interface program code of the presence awareness system. In accordance with another aspect of the invention, a user has the capability to update his or her presence information. In accordance with still another aspect of the invention, the system automatically collects presence information about the user and automatically updates his or her presence information. In accordance with yet another aspect of the invention, the presence awareness system may use specification-based testing at run-time to monitor whether some users' presence awareness policies have inadvertently been violated, further strengthening the reliability of the system.

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Du Li