The client decides when the project can move to the Closing Phase. This is not an arbitrary decision, but one based on the acceptance criteria initiated during project planning and maintained throughout the project. Whenever a scope change request has been approved, the acceptance criteria are updated to reflect that.
In most cases, the acceptance criteria are nothing more than a checklist that reflects the client requirements. After all of the items have been check-ed as satisfactorily completed, the project is ready to move to the closing activities.
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