Which is a purpose of the quality theme?

The purpose of the PRINCE2 Quality theme is to define and implement the means by which the project will create and verify products that are fit for purpose. Option A, defining specific conditions for usability, is a core activity within this theme. It involves establishing clear and agreed-upon acceptance criteria (a form of quality criteria) that allow the project to check whether a product meets the customer's quality expectations and is therefore usable and acceptable.

B. This describes the purpose of the Communication Management Approach, which is part of the Organization theme, not the Quality theme.
C. This is the primary purpose of the Business Case theme, which assesses if the project remains desirable, viable, and achievable throughout its lifecycle.
D. While assessing improvements is part of quality activities (e.g., quality reviews), the theme's overall purpose is the broader definition and management of the quality approach.

AXELOS. (2018). PRINCE2 Agile® Foundation. TSO (The Stationery Office). Section 13.1, "Purpose of the quality theme," p. 101. The manual states the purpose is "to define and implement the means by which the project will create and verify products that are fit for purpose."

AXELOS. (2018). PRINCE2 Agile® Foundation. TSO (The Stationery Office). Section 13.2.1, "Customer quality expectations and acceptance criteria," p. 102. This section details how quality expectations are captured.