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Web services can be composed to create complex business processes that span multiple organizations. Quality of Service (QoS) of such a process is guaranteed by a set of Service Level Agreements (SLAs) between the service providers and the service consumers. Monitoring is required at every service provider and at the service consumer end in order to ensure satisfaction of the SLAs. Distributed monitoring of business processes can be complex and costly. The authors propose a middleware solution, namely the Performance Monitor (PM) framework, to enable outsourcing of the task of SLA monitoring of both intra and inter-organizational composite Web service processes.
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