In ITIL
- An
SLAis a Service Level Agreement (potentially a legal contract) - An
SLOis a Service Level Objective (and thus could be a KPI) - An
SLRis a Service Level Requirement (a clause in an SLA? a required level for an SLO?) - But what does
SLEstand for?
From the context, it looks like it is a soft version of an SLA.