Flexibility of process support is a key requirement for current and future business applications. A technology which is designed to flexibly support various kinds of processes are workflow management systems. In this paper we present INCOME/WF -a prototype of a workflow management system based on high-level Petri nets as workflow modelling and execution language. Important requirements for INCOME/WF are easily adjustable workflow schemes and support for unstructured or weakly structured activities. Both requirements are not yet sufficiently fulfilled by existing WFMS.

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