With the rapid development of the cloud computing technology, it has matured enough for a lot of\nindividuals and organizations to move their work into the cloud. Correspondingly, a variety of\ncloud services are emerging. It is a key issue to assess the cloud services in order to help the cloud\nusers select the most suitable cloud service and the cloud providers offer this service with the\nhighest quality. The criteria parameters defining the cloud services are complex which lead to\ncloud service deviation. In this paper, we propose an assessment method of parameters importance\nin cloud services using rough set theory. The method can effectively compute the importance\nof cloud services parameters and sort them. On the one hand, the calculation can be used as\nthe credible reference when users choose their appropriate cloud services. On the other hand, it\ncan help cloud service providers to meet user requirements and enhance the user experience. The\nsimulation results show the effectiveness of the method and its relevance in the cloud context.
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