Before you start: Identify the sponsor and the delivery team.
Try it
Two managers both believe they can approve a scope change. What needs clarification?
Your reasoning, assumptions and units:
Apply it to your work
Describe a comparable situation. What evidence would you need before using this reasoning to make a decision?
Your example and next check:
Answer and reasoning
Agree the decision owner, delegated limits, consultation and escalation route. A responsibility matrix helps expose the ambiguity; it cannot create authority by itself.
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