PRINCE2 Foundation Exam 2025 - Free Sample Practice Questions and Study Guide.

The purpose of taking action to ensure that the stage remains within tolerance is specifically addressed in the process of Controlling a Stage. This process involves monitoring the progress of the project stage, managing any deviations from the plan, and taking corrective actions when necessary to keep the project on track. It ensures that the project manager can implement running checks on the stage's performance against the plan, facilitating timely adjustments to maintain control over the project's execution and delivery.

In this context, tolerance refers to the acceptable limits of variation in performance measures (such as time, cost, quality, etc.) as defined in the project plan. The Controlling a Stage process is essential for actively managing and steering the project stage, ensuring that the project remains viable and aligned with its objectives.