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.References: = PRINCE2 7 Foundation handbook and online resources

Similar to the answer to question 11, the change budget is specifically allocated for changes that are agreed upon that modify the scope of the project. This ensures that any scope modifications are funded without compromising the existing budget for planned deliverables. References: PRINCE2 Foundation official study guide and online resources.

The 'Starting up a Project' process in PRINCE2is typically triggered when a project mandate is available.
The project mandate provides the basic information necessary to define whether there is sufficient justification to proceed with the project's setup.References: PRINCE2Foundation Manual

Before the Starting up a Project process begins, corporate or programme management should provide sufficient information to identify the prospective Executive. The Executive is a key role within the project board, responsible for overall project direction and management. References: PRINCE2 Foundation Training Manual; PRINCE2 2017 Foundation handbook.

A key step in the recommended approach to 'defining and analyzing the products' in PRINCE2 is writing a Project Product Description. This description captures the purpose, composition, derivation, and acceptance criteria of the project's main deliverable. References: PRINCE2 Foundation Training Manual; PRINCE2
2017 Foundation handbook.