Abstract
Due to the absence of commonly accepted conceptual and formal foundations for workflow management, and more generally Business Process Management (BPM), a plethora of approaches to process modelling and execution exists both in academia and in industry. The introduction of workflow patterns provided a deep and language independent understanding of modelling issues and requirements encountered in business process specification. They provide a comparative insight into various approaches to process specification and serve as guidance for language and tool development. YAWL (Yet Another Workflow Language) is a novel and formally defined workflow language based on workflow patterns and Petri nets, thus leveraging off both practical and theoretical insights in the field of BPM. This chapter provides an overview of this language and its corresponding open source support environment.
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