Body of Knowledge · Glossary
Error budget
The tolerable shortfall against a service-level objective, treated as a resource to spend that gates risk-taking. With budget available, ship; with the budget exhausted, stabilise. It is only as good as leadership's willingness to obey it when that is inconvenient.
Where the standard develops it
- DE-3Reliability, incident response, and operational ownershipOn-call, SLOs, postmortems, learning from failure.
- CC-5Values, integrity, and ethical judgment under pressureWhat you do when the right call is the costly one.
Related terms
- Blameless postmortem
- An incident review that asks how the system allowed the failure and what to change, rather than who to blame.
- Brilliant jerk
- A high performer whose behaviour breaches the team's values.
- Costly moment
- A situation in which a stated value and the pressure of the moment point in different directions, and people are watching the decision.
- Culture
- The accumulated pattern of what behaviour gets rewarded, tolerated and punished in practice.
- DORA metrics
- The four research-validated delivery measures (deployment frequency, lead time for changes, change failure rate, time to restore service).
- Incident command
- A single defined role, assigned before the incident, that owns coordination and communication so that responders can focus on the fix.
- Ownership map
- The written record of every system, capability and decision and who owns each, checked before and after any structural change.
- Service ownership
- Every service has a named owner responsible for its operation, its interface stability, its documentation and its future.
Cite this definition
Chicago, BibTeX and licence →Engineering Management Academy. (2026). Error budget. In Engineering Management Academy Body of Knowledge (Version 3.1, GLO.error-budget). https://www.engineeringmanagement.academy/body-of-knowledge/glossary/error-budget