Simulation modeling projects commonly involve distributed team collaboration. It is currently difficult to perform collaboration in distributed modeling process for two reasons: 1) Simulation modeling in general requires modelers to manage complexities (such as tracking model revisions, recording scenario assumptions and organizing external artifacts) related to the model. 2) Distributed collaboration requires collaborators to maintain change awareness. While proper information technology support is known to lessen the difficulties of collaborations, there is limited software support for complexity management in generic modeling process and change awareness in distributed collaboration, therefore require tremendous amount of effort in management and communication. This thesis describes a new system that supports distributed modeling process. The system provides modeling repositories to help manage modeling complexities and a visual workspace to provide change awareness information. The system has been shown to substantially reduce modeling effort in distributed modeling, is extensible and easy to use
