What term refers to the effectiveness, efficiency, and satisfaction of a product's use by specified users for specified goals?

The term that refers to the effectiveness, efficiency, and satisfaction of a product's use by specified users for specified goals is usability. Usability is a critical aspect of product design that assesses how easily and satisfactorily users can achieve their objectives when interacting with a product. It encompasses various elements such as how intuitive the interface is, how quickly tasks can be completed, and how much satisfaction users derive from their experience.

This definition emphasizes not only achieving tasks but doing so with a satisfactory level of ease and effectiveness, which is what usability aims to measure and improve. Therefore, when evaluating a product's usability, one considers how well the design meets the users’ needs and expectations, allowing for a comprehensive assessment of their experience.

Other terms, while related, focus on different aspects of interaction or design. User experience broadly encompasses all interactions a user has with a product, including emotions and perceptions over time, while user engagement emphasizes the level of involvement and interest users have in a product. User interface specifically refers to the means by which users interact with the system and does not cover the satisfaction and effectiveness aspects comprehensively.