Service Level Objective
What is Service Level Objective (SLO)?
A Service Level Objective (SLO) is an internal performance target that a support team sets for itself, usually 10–20% stricter than the contractual Service Level Agreement with customers. SLOs create a buffer: if the team misses its internal SLO, there is still time to intervene before missing the customer-facing SLA. SLOs are owned and managed by the support operations team, while SLAs are committed to customers in contracts.
How is SLO calculated?
SLO = SLA target × (1 − buffer factor). Example: if SLA first reply = 4 hours, SLO = 3 hours (25% buffer)
The buffer percentage should reflect the realistic variance in your operation. Teams with predictable volume and stable staffing can use a 10% buffer; teams with high variability or single-timezone coverage should use a 20–25% buffer.
What is a good SLO?
Recommended SLO-to-SLA buffer
What are the most common SLO mistakes?
- 1Setting SLOs equal to SLAs. With no buffer, any staffing variance or volume spike immediately becomes a customer-facing SLA failure.
- 2Not communicating SLOs to agents. Agents should know the internal target (SLO), not the contractual floor (SLA), to build healthy operating margin.
- 3Measuring SLO compliance the same way as SLA compliance. SLO misses should trigger an internal operational review; SLA misses require customer communication.
- 4Forgetting to revise SLOs when SLAs change. Outdated SLOs no longer protect updated SLA commitments.