document: Discovering the best web service Major research challenges in discovering Web services include , provisioning of services across multiple or heterogeneous registries , differentiating between services that share similar functionalities , improving end-to-end Quality of Service ( QoS ) , and enabling clients to customize the discovery process . Proliferation and interoperability of this multitude of Web services have lead to the emergence of new standards on how services can be published , discovered , or used ( i.e. UDDI , WSDL , SOAP ) . Such standards can potentially provide many of these features and much more , however , there are technical challenges associated with existing standards . One of these challenges is the client . s ability to control the discovery process across accessible service registries for finding services of interest . This work proposes a solution to this problem and introduces the Web Service Relevancy Function ( WsRF ) used for measuring the relevancy ranking of a particular Web service based on QoS metrics and client preferences . We present experimental validation , results , and analysis of the presented ideas .
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