The aim should be to fairly integrate best practices and requirements that preserve the service and avoid additional costs. Once a set of criteria has been defined, the next step is to assess the criticality of the cloud service and associated data. Almost all computer systems can be made extremely reliable, but the costs can be too high. Not all systems need the same level of reliability as NASA for space shuttles, and few of them could pay the costs. Even if taken to the extreme, SLAs are not a protection against human errors that cause downtime and availability issues, as we have seen recently during the recent flood of problems related to the availability of banking systems in the UK. In the case of TSB and the botched migration of its IT systems, its SLAs didn`t count at all. Service Description – The SLA needs detailed descriptions of each service offered in all possible circumstances, including processing times. Service definitions should include how services are provided, whether maintenance service is provided, how operating hours are, where there are dependencies, an overview of processes, and a list of all technologies and applications used. A service level agreement (SLA) is a contract between a service provider and its customers, which documents the services that the provider will provide and defines the service standards that the provider is required to meet. Injected traffic parameters include packet size, package distance, protocol type, and DSCP marking. The operation can be planned to generate traffic and perform power measurements at specific times, with a predefined frequency, in order to provide the expected accuracy. For example, a service provider may include greater granularity of measurement at peak times when performance issues are more likely.