document: Reliable QoS monitoring based on client feedback Service-level agreements ( SLAs ) establish a contract between service providersand clients concerning Quality of Service ( QoS ) parameters . Without properpenalties , service providers have strong incentives to deviate from theadvertised QoS , causing losses to the clients . Reliable QoS monitoring ( andproper penalties computed on the basis of delivered QoS ) are thereforeessential for the trustworthiness of a service-oriented environment . In thispaper , we present a novel QoS monitoring mechanism based on quality ratings from theclients . A reputation mechanism collects the ratings and computes theactual quality delivered to the clients . The mechanism provides incentives forthe clients to report honestly , and pays special attention to minimizing costand overhead1 .
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