Which principle ensures that a project remains viable?
Correct.
Why this answer
The Continued Business Justification principle ensures that a project remains viable by requiring ongoing validation of the business case throughout the project lifecycle. If the justification ceases to be valid (e.g., costs exceed benefits or strategic alignment is lost), the project should be stopped. This principle is the foundation for PRINCE2's focus on value for money and risk management.
Exam trap
A common pitfall is confusing the Continued Business Justification principle (which ensures viability) with the Manage by Stages theme (which provides control), leading candidates to incorrectly associate stage-gate reviews with ongoing justification.
How to eliminate wrong answers
Option A is wrong because Manage by Stages is a process-based principle that divides the project into management stages for control and review, but it does not directly address ongoing viability or business justification. Option B is wrong because Learn from Experience focuses on capturing and applying lessons learned from previous projects to improve performance, not on ensuring the current project remains viable. Option D is wrong because Tailor to Suit the Project is about adapting PRINCE2 processes to the project's environment, not about maintaining business justification or viability.