During the Closing a Project process in PRINCE2, the ownership of the project's products is formally transferred to the customer, ensuring that all deliverables have been accepted and are ready for operational use. This transfer marks the formal completion of the project. References: PRINCE2 Foundation official study guide and materials.

The principle of continued business justification in PRINCE2 means that a project must remain justified throughout its life cycle. The key factor is the project's ongoing justification, not solely its ability to deliver financial benefits. Projects may continue for reasons other than financial gain, such as strategic importance, compliance, or public safety. Therefore, stopping a project based only on financial criteria does not reflect this principle accurately. References: PRINCE2 Foundation manual, PRINCE2 official resources

Project Assurance in PRINCE2 is focused on the project's adherence to standards and procedures within the project environment, providing a project-level view of compliance. In contrast, Quality Assurance is an organizational level function that oversees compliance across all projects and operations, ensuring that the entire organization follows the prescribed standards. References: PRINCE2 Foundation Training Manual; PRINCE2 2017 Foundation handbook.

The purpose of the 'Quality' practice in PRINCE2 is to ensure that the project's products meet the documented expectations of the user or stakeholders. This involves defining quality requirements and standards for the project and its products and setting out the necessary activities to achieve these standards, thereby ensuring that the project delivers outputs that are fit for use.References: (PRINCE2 7 Foundation Handbook, AXELOS)

The purposes of the quality theme in PRINCE2 are to establish how the project will ensure that products are fit for purpose and meet stakeholder expectations (purpose 2) and to ensure that the project's objectives are desirable and achievable, which pertains to ensuring that the project has a solid business justification (purpose
3). References: PRINCE2 Foundation Handbook, Quality Theme section.