What Is SLA?

An SLA, or Service Level Agreement, is a documented agreement between a service provider and a customer that defines the level of service expected. In the context of managed IT services, an SLA typically specifies response times for different priority levels (e.g., critical issues responded to within 15 minutes, standard requests within 4 hours), uptime guarantees (e.g., 99.9% network availability), and what happens when those commitments aren't met — usually service credits or other remedies.

SLAs serve as both a quality standard and an accountability mechanism. For the customer, an SLA provides clear expectations about the service they'll receive and recourse when those expectations aren't met. For the provider, an SLA creates measurable performance targets that drive operational discipline. The best SLAs are specific and measurable — "fast response times" is meaningless; "critical issues acknowledged within 15 minutes and a technician engaged within 30 minutes" is actionable and verifiable.

When evaluating an MSP or IT provider, the SLA is one of the most important documents to review carefully. Key elements to examine include: how issue severity levels are defined (who decides if something is "critical" vs. "standard"?), whether response time means acknowledgment or actual resolution, what uptime guarantees exclude (scheduled maintenance, third-party outages), and what remedies are available when the provider falls short. A provider unwilling to commit to specific SLA terms is a provider you should think twice about.