ISO 9241-11:2018 defines as the extent to which a system, product or service can be used by specified users to achieve specified goals with effectiveness , efficiency and satisfaction in a specified context of use .
: The user's subjective response, including their comfort and positive attitude toward using the system. The 2018 Revision: What Changed? iso 9241-11 2018 usability definition
The standard breaks down usability into three primary, quantifiable dimensions: ISO 9241-11:2018 defines as the extent to which