A project manager is working on a construction project. The project board has set a tolerance for cost, but the project manager has been given authority to manage the project within that tolerance without seeking approval for every decision. However, the project manager must escalate to the board if the tolerance is forecast to be exceeded. Which PRINCE2 principle is being applied?
This principle establishes tolerances and delegates authority so that the project manager can work within them without constant board involvement. Escalation occurs only when tolerances are threatened. The scenario directly describes this: the board sets cost tolerance and the project manager manages within it, escalating only if exceeded.
Why this answer
Manage by exception is the principle that enables the project board to set tolerances and delegate authority to the project manager. The project manager only escalates when a tolerance is forecast to be exceeded. This is exactly what the scenario describes, making it the correct principle.
The other principles are not directly demonstrated by the tolerance-setting and escalation process.
Exam trap
The trap here is confusing manage by exception with define roles and responsibilities, because both involve authority, but the key differentiator is the existence of tolerances and escalation triggers.