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{{Orphan|November 2006}}
'''Service Level Objectives''' (SLOs) are a key element of a [[Service Level Agreement]] between a [[Service Provider]] and a [[customer]]. SLOs are agreed as a means of measuring the performance of the Service Provider and are outlined as a way of avoiding disputes between the two parties based on misunderstanding.
There is often confusion in the use of SLA and SLO. The SLA is the entire agreement that specifies what service is to be provided, how it is supported, times, locations, costs, performance, and responsibilities of the parties involved. SLOs are specific measurable characteristics of the SLA such as availability, throughput, frequency, or quality.
The SLO may be composed of one or more quality-of-service measurements that are combined to produce the SLO achievement value. As an example, an availability SLO may depend on multiple components, each of which may have a QOS availability measurement. The combination of QOS measures into a SLO achievement value will depend on the nature and architecture of the service.
In ''Foundations of Service Level Management'' ([[2000]]), [[Rick Sturm]] and [[Wayne Morris]] argue that SLOs must be:
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* Affordable
* Mutually acceptable
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