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The Cloud Computing utility model has raised a number of challenges particularly in relation to service provisioning and user requirements. In such a service driven environment it is very important that resource provisioning can be optimized and users and applications have some level of assurance that their requirements can be satisfied. However, in order to guarantee a certain level of Quality of Service (QoS) Service Level Agreements (SLA) which specify contracts between providers and users are commonly used. This paper aims to investigate the QoS issues and SLA management within Cloud Computing and to present a framework for QoS assurance.