Abstract

Confronted with changing environments, dynamicity is inevitable and business processes are characterized by indefiniteness, which requires that workflow systems should be flexible and dynamic. Most of current workflow systems are activity-based, paying little attention to people and their roles. However, it is noteworthy that ignore of roles maybe one of the main reasons for lack of dynamicity in most of present workflow products. In essence, a workflow is goal-driven and it is roles and their coordination that attain business goals. Moreover, exceptions are often attributed to and settled by roles. This paper discusses a role-based dynamic workflow model, which has advantages over the activity-based workflow model in terms of flexibility. The research mainly focuses on the correlation between roles and the flexibility of workflow systems. And a new representation of role-based workflow models is given, integrating message sequence charts and ECA rules.

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