Work/low technology is widely used in business process modeling, software process modeling as well as en-terprise information integration. At present, there exist a variety of workflow modeling approaches, which differ in the easiness of modeling, expressiveness and formalism. In this paper, the modeling approaches most used in research project and workflow products are compared. And the verification of workflow model is also dealt. We argue that a ideal workflow modelin~ approach is a hybrid one, i.e. the inteuration of the above approaches.
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