A task of product-based planning in PRINCE2 is to write the Project Product Description. This is part of defining and documenting the project's output, outcome, and benefits, which are crucial for planning the project effectively. References: PRINCE2 Foundation official documentation and study materials.

For a project to be considered a PRINCE2 project, it must meet the minimum requirements for applying the seven PRINCE2 themes. These themes (Business Case, Organization, Quality, Plans, Risk, Change, and Progress) provide a framework for managing the project and ensuring that it is conducted in a systematic, consistent manner that is aligned with PRINCE2 principles.References: = PRINCE2 7 Foundation handbook and online resources

A key decision made during the 'directing a project' process is to confirm that the benefits management approach addresses all expected benefits. This ensures that the project is aligned with its intended outcomes and that all potential benefits are adequately planned for and tracked. References: PRINCE2 Foundation Training Manual; PRINCE2 2017 Foundation handbook.

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

The 'Controlling a Stage' process should be used during each delivery stage of a project. This process is essential for the day-to-day management of the project stage by the project manager. It includes monitoring, reporting, and responding to issues within the stage to ensure the project remains within agreed tolerances.
References: = PRINCE2 7 Foundation handbook and online resources