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Supporting delegation mechanisms in workflow systems is receiving increasing interest from the research community. An important requirement of a constrained workflow is to guarantee the satisfiability of the workflow, which requires that some set of authorized users can complete a workflow. Typically, any mechanism that is used to establish the satisfiability of a workflow is based on the workflow specification and the user authorization information. The effect of a successful user delegation request is to change the user authorization information, thereby affecting the satisfiability of the workflow.
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