Web Services technology is a promising computing paradigm for applications integration o ver the Internet. Use of Web services and related technologies facilitates the implementation of virtual enterprises across heterogeneous hardware and software platforms. This paper proposes a Web services / agent-based model for inter-enterprise collaboration. It presents a multi-agent model in different levels of the enterprise's system architecture to accomplish a suitable selection of a registered service, to check the status of a process, to realize users' requests, and to react to them in a collaborative way with other agent-based Web services. Moreover, the paper proposes a multi-agent model to define a dynamic workflow capable of coordinating and monitoring the workflow processes.
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