Workflow technology is a particular kind of IT for supporting work by enacting explicitly modeled and represented business processes. Thus, conceptual models of business and work processes are essential for process design as well as for process support in the form of workflow enactment. The author describes the APM (Action Port Model) workflow modeling language which builds upon existing IS conceptual modeling languages. Even if based on traditional languages, APM is intended to be the basis for a flexible workflow support environment supporting ad hoc workflow, conform to ideas of workflow models as plans for situated action.
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