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To integrate CAD systems with other applications in the ClM world, two principal approaches are currently under development. The feature based CAD systems provide higher level primitives which support not only the generation of the drawing but also serve as basic input for other ClM components. Another approach enables any ClM component to recognize the higher level entities used in CAD systems out of a lower level data exchange format, which might be the internal representation of such systems as well as some standard data exchange format. In this paper the authors examine both approaches in more detail. First a conceptual llIodel of CAD and-as an example of another e lM component-of ('APP is represented. Comparing these two models the autho rs investigate the possible int.egratiolls on t.he different levels and provide a concise t.erminology and advant.ages ami disadvant.ages of the different approaches.