Note 1: The “specified”users, goals and context of use refer to the particular combination of users, goals and context of use for which usability is being considered.
Note 2: The word “usability” is also used as a qualifier to refer to the design knowledge, competencies, activities and design attributes that contribute to usability, such as usability expertise, usability professional, usability engineering, usability m
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Source
ISO 9241-11 (2018) Ergonomics of human-system interaction — Part 11: Usability: Definitions and concepts