A support extension process Meta -model of flexible workflow

Supporting dynamic changes and flexibility is an essential requirement for any workflow management system (WfMS). Related research works are all focused on some special changing issues. In this paper we propose exception detection - dynamic separation method, through the message mechanism to detect exception and then send message to the workflow-engine, workflow-engine receives the message, dynamically separate exception, and make exception only affect part of the process activities. Based on this mechanism, we extensions and modifications to workflow meta-model proposed by workflow management coalition. The extensions process Meta -model can effectively solve dynamically change and flexibility, satisfy the variability of business process and improve workflow management system flexibility.