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This article presents a conceptual framework that characterizes the quality of Web services, an algorithm that quantifies them, and a system architecture that ranks Web services by using the proposed algorithm. In particular, the algorithm, called UsageQoS that computes the scores of quality of service (QoS) of Web services within a community, makes use of the usage frequencies of Web services. The frequencies are defined as the numbers of times invoked by other services in a given time period. The UsageQoS algorithm is able to optionally take user ratings as its initial input. The proposed approach has been validated by extensively experimenting on several datasets, including two real datasets. 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