Decisions regarding the tailoring of the project should be recorded in the Project Initiation Documentation (PID). The PID is the key document that defines how the project is to be managed and includes specific references to any tailoring decisions made to fit the project's environment. References: PRINCE2 Foundation Handbook, Project Initiation Documentation section.

The minimum requirement for applying the Quality Theme in PRINCE2 is to define the project's approach to quality assurance. This includes establishing how the project will ensure that it meets the relevant quality standards and stakeholder expectations. Quality assurance is an integral part of the overall quality management strategy, which includes quality planning, quality control, and continual improvement practices.
PRINCE2 Foundation Manual

The 'manage by stages' principle in PRINCE2 dictates that the end of each stage provides a control point at which the project board can review progress, reassess project viability, and decide on the next steps. This approach allows for regular monitoring and decision-making, ensuring that the project remains aligned with its objectives and within its tolerances.
PRINCE2 7 Foundation guide on the 'manage by stages' principle.

A minimum requirement for applying the Change Theme in PRINCE2 is to record every issue that is raised in the issue register. This ensures that all potential and actual deviations from the plan are captured and managed appropriately, maintaining control over changes and supporting effective decision-making. References:
PRINCE2 7 Foundation Handbook and official training materials.

A project is defined as a temporary organization that is created for the purpose of delivering business products according to an agreed business case. This definition emphasizes the temporary and purpose-driven nature of a project, which is organized to achieve specific business objectives and then disbanded upon achieving its goals. References: PRINCE2 7 Foundation manual and basic project management concepts.