Learn in the textbookChange and Service Transition
DefinitionService acceptance criteria (サービス受入れ基準) are the pass conditions set in advance to judge whether a new or changed service may start being used in production.
ExplanationTypical items ask whether the required performance is met, whether testing is finished, and whether the operating procedures are in place with staff ready to handle the service. The criteria are agreed with stakeholders at the planning stage, not just before the transition.
AnalogyIt is like the passing score on a driving test. Because the scoring standard is fixed beforehand, anyone looking at the result reaches the same pass-or-fail decision.