A member of the Project Board is responsible for quality assurance in PRINCE2. Quality assurance is concerned with ensuring that the project's products meet the quality requirements set out in the project and that the project adheres to the appropriate corporate, programme management, or customer quality standards.
References: PRINCE2 Foundation manual, PRINCE2 official resources

hen the project board reviews the Project Initiation Documentation (PID), it is essential to ensure that the PID is aligned with the business objectives. The PID should encapsulate the project's definition, including the reasons for undertaking the project, the benefits expected, and how it aligns with the broader business goals.
Ensuring this alignment helps validate that the project remains viable and worthwhile as it progresses.
References: (PRINCE27 Foundation Handbook, AXELOS)