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Recently, Cloud Computing has become an emerging research topic in response to the shift from product oriented economy to service-oriented economy and the move from focusing on software/system development to addressing business-IT alignment. More technically, Cloud Computing enables building Cloud Service-Based Application (CSBA) which cater for the tailoring of services to specific business needs using a mixture of SaaS, PaaS and IaaS solutions - possibly from various providers. In other words, in the context of CSBAs, cloud services are rented by clients from providers instead of owning the services. Due ti this specific nature, SLA (Service Level Agreement) has become a very important and up-to-date issues in CSBAs. Therefore SLA turns to be very critical for both cloud service clients and providers and needs constant monitoring for various purposes mostly detecting if any violation happens but …