The application of the "Continued Business Justification" principle in PRINCE2 helps to define what should be included in a project. This principle ensures that a project remains viable and relevant, with a clear justification for starting and continuing each stage of the project. It supports decision-making about the inclusion of specific components or activities based on their contribution to project objectives and expected benefits. References: PRINCE2 Foundation Handbook, Continued Business Justification section.

The "Managing a Stage Boundary" process in PRINCE2is designed to provide the project board with information to review the performance of a completed stage, confirm the continued business justification, and decide whether to proceed with the next stage. This process includes preparing key documents such as the End Stage Report and the next Stage Plan. References: PRINCE2Foundation Handbook, Managing a Stage Boundary section.

PRINCE2 recommends three levels of planning (Project Plan, Stage Plan, Team Plan) to reflect the needs of different levels of management involved in a project. Each plan serves a specific management purpose and addresses the needs of different management levels within the project. References: PRINCE2 Foundation official documentation and study materials.

Stakeholders in PRINCE2 are typically characterized by being affected by the project (either through impact or interest) and frequently interacting with the project, contributing inputs or being consulted for various aspects. This recognizes stakeholders as both internal and external to the organization, and not all stakeholders necessarily agree with every project objective. References: PRINCE2 Foundation Handbook, Stakeholder section.

To understand how user assurance will support the senior user on the project, the senior user should review the 'Role Descriptions' management product. This document outlines the responsibilities and interfaces for all project roles, including how user assurance supports the senior user by ensuring that the project's products meet the needs and requirements of the users.References: PRINCE27 Foundation documentation on management products, particularly Role Descriptions.