Abstract: definition of integration is proposed, and the application on the STEP methodology is discussed.Then a STEP__ based framework of integrated systems is presented.The framework is open to other systems and well expansive.It-allows to integrate the information which needs to be shared with available application systems, and can support the whole design and manufacture proeess for mechanical parts. The system has been partly implemented and verified. In addition,the data model for the system is set up through the definitions of units of functionality.

Key words: computer aided manufacturing, systems integration, models