A service level agreement, or SLA, is a defined commitment for how quickly or how well a support team will respond to and resolve customer issues, written as a measurable target, like responding within two hours or resolving 95% of tickets within a set time. It sets an agreed standard that performance actually gets measured against.

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‍Why it matters

Without an SLA, good support is just a feeling. One person's idea of a reasonable response time might be an hour and another's a day, with no way to hold a team to either. An SLA turns that expectation into a number someone can check, which matters once a paying client or internal stakeholder needs to trust that issues get handled in a predictable window. SLAs usually cover more than one measure, such as first response time, resolution time, and sometimes availability of the support channel itself. Missing one often triggers something specific, like an escalation, a client credit, or a formal review.

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‍How it runs in practice

Specific metrics and target numbers get agreed up front. Every ticket or call is timestamped so performance can be measured automatically instead of estimated, and results show on a dashboard that updates continuously, not just at month end. A classic phone benchmark is answering 80% of calls within 20 seconds, though the right target varies by channel and business. When performance drops below target, the usual response is added staffing, a process review, or a conversation with the client.

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‍SLA versus ticket SLA

An SLA is the overall commitment, and a ticket SLA is how it plays out on each individual ticket, with a clock that depends on priority. A high-priority ticket might need a first response within an hour while a routine one has a full day. The SLA sets the promise, and the ticket SLA is how it gets tracked case by case.