SLAs you can actually keep
An ambitious service level you miss every month is worse than a modest one you always hit. Credibility beats aspiration.
A service level agreement — a promise about response time, uptime, or turnaround — is meant to set expectations and build trust. Teams often set ambitious ones to look good, then miss them routinely. A target you miss constantly is worse than no target: it teaches everyone your promises don't mean anything.
Credibility over ambition
The value of an SLA is that people can rely on it. If you promise an hour and deliver four most of the time, you've trained your customers to distrust the promise and plan around the worst case anyway. A modest commitment you reliably keep is far more valuable than an impressive one you don't.
Set what you can sustain
Base your commitments on what you can actually deliver consistently, including on a bad day, not on your best-case performance. Leave headroom. It's better to under-promise and beat it than to set a number that turns every busy week into a broken promise.
A target you miss every month isn't a standard. It's a confession that your promises are negotiable.