Section: Volume B
Explanation/Reference: http://prince2.wiki/
Introduction:_The_PRINCE2_Foundation_Training_Manual#Six_variables_.2F_six_performance_targets

Approved plans enable control primarily by defining what is included within the approved project scope, which helps to avoid scope creep. These plans establish clear boundaries and deliverables for the project, which are essential for managing resources and ensuring that the project team remains focused on delivering the specified outputs without unnecessary expansion of the project scope.References: (PRINCE2 7 Foundation Handbook, AXELOS)

The Managing Product Delivery process in PRINCE2 covers the work done by external suppliers, even if they are not using PRINCE2. This process ensures that the work assigned to external suppliers is managed effectively, focusing on the acceptance, execution, and delivery of project products according to the agreed requirements. References: PRINCE2 Foundation manual, PRINCE2 official resources