Each SLA management strategy takes into account two well-differentiated phases: contract negotiation and real-time execution monitoring. Therefore, the SLA administration includes the definition of the SLA contract: the basic scheme with the QoS parameters; THE AES negotiations; SLA surveillance; detection of ALS lesions and the application of ALS, as directed. The main point is to create a new level for the grid, cloud or SOA middleware, capable of creating a trading mechanism between service providers and consumers. For example, the EU-funded Framework SLA@SOI 7 research projectexplores aspects of multi-level, multi-supplier slas within service-based infrastructure and cloud computing, while another EU-funded project, VISION Cloud, has delivered results in terms of content-based ALS. The defined level of services should be specific and measurable in each area. This determines the quality of service (QoS) and, if required by law, is rewarded or sanctioned accordingly. Ultimately, ALS is your contract with the service provider and sets expectations for the relationship. It should be written to protect your cloud services based on the risk you are willing to accept. The goal is to have an ALS that consumers and cloud providers understand and accept, including an exit strategy.
ALS should be seen as a document defining partnership between the parties and used to mitigate potential problems. The ALS should also set compensation for users if the specifications are not met. A cloud storage service provider typically offers a multi-tiered service credit plan, which grants users credits based on the discrepancy between DenSLA specifications and the service levels actually provided. Service level agreements are also defined at different levels: an SLA evaluation process should be completed for each new cloud service. However, ALS is a living agreement and, as services change, ALS should be reassessed. SLAs often include many elements, from the definition of services to the termination of the contract.  In order to ensure rigorous compliance with ALS, these agreements are often designed with specific lines of demarcation and the parties concerned must meet regularly to create an open communication forum.