Fixed scope
Use a defined deliverable and acceptance criteria when requirements are stable enough to estimate. Set a change-control process for new requests.
Dedicated capacity
Choose agreed skills and time when priorities will evolve and your team can manage the backlog. Capacity does not mean unlimited throughput.
Managed delivery
Delegate a defined workstream when you need one party to coordinate execution and reporting. Keep business decisions and approval responsibilities explicit.
Compare the handover
For every model, agree ownership, account access, documentation, support and exit arrangements before work begins.
Make it specific to your situation.
Use this guide as a starting point. The next useful step is to record the real context, identify the decisions that need an owner and agree what evidence would support the decision.