Within service design, what is the key output handed over to service transition?

Measurement, methods, and metrics are outputs of service measurement and reporting activities, not the primary artifact handed from Service Design to Service Transition.

The Service Design Package is a formal document set produced at the conclusion of Service Design that contains everything Service Transition needs to build, test, and deploy a service - including the service design, service model, acceptance criteria, operational requirements, and transition plan. It acts as the definitive contract between Service Design and Service Transition, ensuring continuity and completeness across lifecycle stages.

Service portfolio design is an input used during the Service Design stage and is governed by service portfolio management, making it a precursor rather than an output of Service Design.

Process definitions may be produced as part of Service Design work, but they are components that feed into the SDP rather than the primary handover output itself.