TAILIEUCHUNG - Workflow Mining: Discovering Process Models from Event Logs

In some event detection applications, events of interest occur over a relatively small proportion of the total time: . alarm generation in surveillance systems, and extrac- tive summarization of raw video events. The automatic de- tection of temporal events that are relevant, but whose oc- currence rate is either expected to be very low or cannot be anticipated at all, constitutes a problem which has recently attracted attention in computer vision and multimodal pro- cessing under an umbrella of names (abnormal, unusual, or rare events) [17, 19, 6]. In this paper we employ the term unusual event, which we define as events with the following properties: (1) they seldom occur (rarity);. | 1128 IEEE TRANSACTIONS ON KNOWLEDGE AND DATA ENGINEERING VOL. 16 NO. 9 SEPTEMBER 2004 Workflow Mining Discovering Process Models from Event Logs Wil van der Aalst Ton Weijters and Laura Maruster Abstract Contemporary workflow management systems are driven by explicit process models . a completely specified workflow design is required in order to enact a given workflow process. Creating a workflow design is a complicated time-consuming process and typically there are discrepancies between the actual workflow processes and the processes as perceived by the management. Therefore we have developed techniques for discovering workflow models. The starting point for such techniques is a so-called workflow log containing information about the workflow process as it is actually being executed. We present a new algorithm to extract a process model from such a log and represent it in terms of a Petri net. However we will also demonstrate that it is not possible to discover arbitrary workflow processes. In this paper we explore a class of workflow processes that can be discovered. We show that the a-algorithm can successfully mine any workflow represented by a so-called SWF-net. Index Terms Workflow mining workflow management data mining Petri nets. ------------------------ ------------------------- 1 Introduction During the last decade workflow management concepts and technology 3 5 15 26 28 have been applied in many enterprise information systems. Workflow management systems such as Staffware iBM MQSeries COSA etc. offer generic modeling and enactment capabilities for structured business processes. By making graphical process definitions . models describing the life-cycle of a typical case workflow instance in isolation one can configure these systems to support business processes. Besides pure workflow management systems many other software systems have adopted workflow technology. Consider for example ERP Enterprise Resource Planning systems such as SAP PeopleSoft .

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