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Answer:
SLA is a formal contract between IT service provider and customer. OLA is a contract between IT service provider and another unit of the same organization. Is Systemadmin would be completely different organizational unit - you can define OLA with them. Usually, they are part of the I T Service Management team and there is no OLA with them.
On the other side, IT service management organization signs Underpinning Contract (UC) with vendor.
Read more about different kind of contracts in the articles:
"What’s the content of an ITIL/ISO 20000 SLA?" https://advisera.com/20000academy/blog/2016/06/14/whats-the-content-of-an-itiliso-20000-sla/
"SLAs, OLAs and UCs in ITIL and ISO 20000" https://advisera.com/20000academy/knowledgebase/slas-olas-ucs-itil-iso-20000/
"Who is your ideal ITIL/ISO 20000 Service Level Manager?" https://advisera.com/20000academy/blog/2016/04/19/who-is-your-ideal-itiliso-20000-service-level-manager/
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Jun 16, 2016