A Service-Level Agreement (SLA) is a negotiated agreement between two parties, where one is the customer (or end user) and the other is the service provider. This can be a legally binding formal or an informal ""contract"" (for example, internal department relationships). The SLA records a common understanding about services, priorities, responsibilities, guarantees, and warranties. The SLA may specify the levels of availability, serviceability, performance, operation, or other attributes of the service, such as billing. The ""level of service"" can also be specified as ""target"" and ""minimum,"" which allows customers to be informed what to expect (the minimum), while providing a measurable (average) target value that shows the level of organization performance. In some contracts, penalties may be agreed upon in the case of non-compliance of the SLA (but see ""internal"" customers below). It is important to note that the ""agreement"" relates to the services the customer receives, and not how the service provider delivers that service. SLAs commonly include segments to address: a definition of services, performance measurement, problem management, customer duties, warranties, disaster recovery, termination of agreement.