The Project Mandate triggers a controlled Starting Up process in a PRINCE2 project. The Project Mandate doesn't officially start the project. This sounds like a paradox, but the project doesn't start until the Starting Up process is completed and Project Brief, Outline Business Case and Initiation Stage Plan are all approved.
It is tempting to build too much into a Project Mandate Template. The more you have in the project mandate template, the easier it is to build the Project Brief and Business Case, but a too extensive Project Mandate template will stall triggering a Starting Up process and will potentially tempt stakeholders to avoid the Project Mandate step altogether.
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