Service level agreement (SLA)
A service level agreement defines measurable performance standards a supplier commits to meet, along with measurement methods, reporting requirements, and consequences for falling short. SLAs make expectations explicit, provide the basis for performance management, and often include financial adjustments linked to service level achievement.
Examples
IT services SLA: A managed services agreement specifies 99.9% system uptime, 4-hour response time for critical issues, and monthly performance reporting. Service credits reduce fees if targets are missed, with termination rights if chronic underperformance persists.
Logistics SLA: A 3PL agreement includes on-time shipment targets (98%), order accuracy requirements (99.5%), inventory accuracy (99%), and claims resolution timelines. Regular scorecards track performance against targets.
Manufacturing services SLA: A contract manufacturer's SLA specifies quality targets (100 PPM maximum), on-time delivery (95%), and yield requirements. Failure to meet targets triggers corrective action requirements and potential volume reallocation.
Definition
SLAs transform general expectations into specific, measurable commitments. Without SLAs, discussions about service quality become subjective. With SLAs, both parties know exactly what performance is expected and how it will be measured.
Effective SLAs include: specific metrics with definitions, target levels for each metric, measurement and reporting methods, consequences for missing targets (credits, remediation requirements, termination triggers), and review and adjustment mechanisms.
SLA development requires balancing rigor and practicality. Targets should be achievable but stretch performance. Metrics should be meaningful but measurable. Consequences should motivate without being punitive for minor variations.
SLAs work best when both parties are committed to the standards rather than viewing them as adversarial contract terms. Regular SLA reviews provide opportunity to discuss performance, address issues, and adjust targets as circumstances change.
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