This paper introduces a modeling method for intelligent model features for engineering modeling in industrial CAD/CAM systems. The related research started from earlier results in development of integrated feature based product modeling. An active model is proposed that integrates knowledge from modeling procedures, generic part models and engineers. Paper discusses the scenario of intelligent modeling based engineering. Then key methods for application of computational Intelligence in computer model based engineering systems are detailed including knowledge driven models as well as areas of their application. Next, behavior based models with intelligent content involving specifications and knowledge for the design processes are emphasized. Finally, an active modeling is proposed and possibilities for its application are outlined.