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. Rewards and penalties that apply to the supplier are often set. Most ALS also leave room for regular (annual) revisions to make changes.  A Service Level Contract (SLA) is the service contract component between a service provider and a customer. ALS offers specific and measurable aspects related to the services offered. For example, ALS is often included in agreements signed between internet service providers (Internet service providers, ISPs) and customers. An Operational Level Agreement (OLA) is a contract that defines how different IT groups within a company plan to provide a service or a number of services. THE OLAs were designed to address and solve the problem of computer silos by defining a number of criteria and defining the specific IT services for which each department is responsible. It should be noted that the concept of a Service Level Agreement (SLA) is used in many companies when agreements are discussed between two internal groups, but according to the Information Infrastructure Infrastructure Library (ITIL) framework for best practices, such internal contracts should be referred to as an operational agreement. 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. Service level agreements can contain many service performance metrics with corresponding service level targets.
A common case in IT services management is a call center or service desk. Among the metrics generally accepted in these cases is: the underlying advantage of cloud computing is the sharing of resources, supported by the underlying nature of a common infrastructure environment. SLAs therefore extend to the cloud and are offered by service providers as a service-based contract and not as a customer-based agreement. Measuring, monitoring and covering cloud performance is based on the final UX or its ability to consume resources.