Iso 9241-11 Usability Definition 2018 [portable] Online

redefines usability as a contextual, measurable outcome composed of effectiveness, efficiency, and satisfaction. This modern definition aligns with current user experience practice and service design, moving beyond software-only “ease of use.” For organizations, adopting the 2018 definition means:

It aligns usability with the concept of "universal design," stating that a system cannot be considered highly usable if it excludes a significant portion of the population due to disability or impairment. iso 9241-11 usability definition 2018