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This paper surveys the work done by the LSDIS Lab on recovery for workflow. It then focuses on recovery issues for Web-based workflow with the WebWork enactment service used as a case study. The WebWork enactment service emphasizes ease of development of workflow applications, installation, and use. WebWork provides low overhead, yet what we believe to be effective recovery mechanisms. The paper classifies ten different type of errors or failures that one is likely to encounter in Web-based workflows and explains how WebWork deals with each of them. 1 Introduction Workflow Management Systems (WfMSs) provide an automated framework for managing intraand inter-enterprise business processes. According to the Workflow Management Coalition (WfMC), a Workflow Management System is a set of tools providing support for process definition, workflow enactment, and administration and monitoring of workflow processes [Hollingsworth, 1994]. WfMSs are being used today to re-engineer, streamline, aut...
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