In a commercial environment, it is common for each party involved in a project-namely the customer and suppliers-to have their own business case. This reflects their individual motives, expected benefits, and investment rationale for undertaking the project. Each party's business case addresses their specific strategic, commercial, and operational needs.
= PRINCE2 7 Foundation handbook and online resources

The Project Initiation Documentation (PID) should guide the project management team on how to manage multiple aspects of the project. It is a key management product that includes crucial information like the project's definition, approach to management, and controls. It serves as the baseline document for managing the project's scope, quality, costs, timescales, risk, and benefits. References: PRINCE2 Foundation official guide and project management documentation resources.

A minimum requirement for applying the quality theme in PRINCE2 is to define quality criteria within product descriptions. This includes specifying what the product must do, the standards it must meet, and how quality will be evaluated, ensuring that all project products deliver against the agreed-upon requirements and standards.
= PRINCE2 7 Foundation handbook and online resources