Abstract-Searching of the appropriate cloud services according to consumers' requirements is becoming a complex task, as the number of cloud service providers (CSPs) that offer similar kind of cloud services increases. Service level agreements (SLAs) are commitments of CSPs to their cloud users, but there are only a few simplistic verification mechanisms which ensure that CSPs are delivering cloud services according to service committed. We propose a CSP ranking model based on service delivery measurements and user experience. To rank and select the appropriate CSPs, an intuitionistic fuzzy group decision making is used, as it can include both measurable and non-measurable factors. It also provides the position of each CSP on the basis of particular SLA parameter which helps cloud users to select the CSP according to their specific requirements.

Abstract-Selecting the appropriate cloud services and cloud providers according to the cloud users requirements is becoming a complex task, as the number of cloud providers increases. Cloud providers offer similar kinds of cloud services, but they are different in terms of price, quality of service, customer experience, and service delivery. The most challenging issue of the current cloud computing business is that cloud providers commit a certain Service Level Agreement (SLA), with cloud users, but there is little or no verification mechanisms which ensure that cloud providers are providing cloud services according to their commitment. In the current literature, there is a lack of an evaluation model which provides the real status of cloud providers for the cloud users. In this paper, an evaluation model is proposed, which verifies the quality of cloud services delivered for each service and provides the service status of the cloud providers. Finally, evaluation results obtained from cloud auditors are visualized in an ordered performance heat map, showing the cloud providers in a decreasing ordering of overall service quality. In this way, the proposed service quality evaluation model represents a visual recommender system for cloud service brokers and cloud users.

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