Service Acceptance criteria are used to?

SAC operates within Service Transition, not as a mechanism to ensure the design stage of the lifecycle, which is governed by Service Design processes and activities.

Portfolio Management oversees the full lifecycle governance of services in the portfolio and is a separate concern unrelated to the purpose of Service Acceptance Criteria.

Service Acceptance Criteria define the minimum agreed conditions a service must satisfy before it is accepted into the live environment. They serve a dual purpose - confirming the service can be delivered as specified and that operational teams have the tools, documentation, and capability needed to support it. SAC is a key control mechanism in Service Transition to validate full readiness before production handover.

KPI reporting is handled through Service Level Management and continual improvement reporting processes, not through Service Acceptance Criteria, which are applied at transition time.