The complexity of computer product development has increased dramatically, because of the large volume of data, and the need to integrate sophisticated CAE/CAD/CAM/CIM tools. Since any system to address this need must evolve over time, Digital Equipment Corporation chose to develop the D-BUS architecture for internal use as a design automation framework. The architecture stresses approaches to information management for integration of tools and organizations. Experience indicates that the architectural approach was a correct one, but that additional services were needed.