Utilities, operating authorities and reliability councils representing a majority of the eastern electric power interconnection are working together under the auspices of the Eastern Interconnection Phasor Project to advance the state of the art in power system monitoring and to share information deemed to be valuable in enhancing the reliability of the bulk power grid. The project depends upon the participation of a broad array of stakeholders including manufacturers, software providers, the aforementioned operating/reliability organizations, academia, government, the IEEE and other standards bodies, and more. The project has the potential to bring great value to the participants, the industry as a whole, and the public. This paper describes the project background and organizational structure and provides an overview of the project?s data management system and related project activities.