Section: Volume B

A minimum requirement for applying the change theme in PRINCE2 is to identify whether an issue has the potential to affect the continuation of the project. This involves assessing the impact of potential changes or issues on the project's objectives and deciding whether they warrant considering the project as unviable in its current form.
= PRINCE2 7 Foundation handbook and online resources

During the Managing a Stage Boundary process, the Business Case is used to justify the continuing viability of the project. This involves reviewing and, if necessary, updating the Business Case to reflect any changes or new insights that might impact the project's justification. This helps the Project Board make informed decisions about the future progression of the project.
PRINCE2 7 Foundation handbook and official documents.

Setting tolerances for the three levels of plan (project, stage, and team) in PRINCE2 applies the principle of
'manage by exception'. This principle enables efficient use of management time by focusing on deviations from the plan only if they exceed predefined tolerances, rather than managing every small detail. References:
PRINCE2 Foundation Handbook, Manage by Exception section.