Cloud Computing provides user a complete software environment. To serve resources to customers, Software as a Service providers rent resources from the Infrastructure as a Service Providers. Client applications and service providers negotiate for the sales of services by means of Service Level Agreement (SLA) that acts as a contract between them. Depending on the status of the demand, Infrastru...

Due to the complexity of running distributed and networked systems, we can recognise a trend of virtual re-centralisation of distributed systems. Since outsourcing IT resources, IT service providers are born. The aim of service providers is to run IT components offering qualified IT services to customers, who specify quality demands as service level agreements (SLAs). Service providers use mana...