"Automatic control in manufacturing requires a very rigourous and well defined model of the operation to be controlled. A model which on one hand reflects reality as closely as possible and on the other hand allows easy and fast modifications and updates to reflect the continuous changes in the real world. provides the modelling concepts to describe and maintain the complete manufacturing systems. In addition, CIM-OSA aims to provide at providing consistent engineering and operational environments to model for execution as well as for real time operation control. Keywords: CIM; CIM architecture; enterprise architecture; enterprise modelling; enterprise optimisation; enterprise control; real time control;"