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Due to the increasing popularity of Web services technology and the potential of dynamic service selection and integration, many similar services are accessible. Quality of Service (QoS) is the main factor to differentiate similar Web services. In this paper, we propose a broker-based architecture for dynamic web service selection that facilitates the requester to specify his/her non-functional requirements like QoS along with functional requirements. In our approach, Web services are selected in a way satisfying user preferences expressed as weights over QoS criteria.