Según Tim Bernes Lee, creador de la Web:
Según el borrador de la norma ISO CD 9241-171 "Ergonomics of human-system interaction — Guidance on software accessibility"
NOTE 1: Although "accessibility" typically addresses users who have a disability, the concept is not limited to disability issues.
NOTE 2: The usability-orientated concept of accessibility focuses on achieving levels of effectiveness, efficiency and satisfaction that are as high as possible taking account of the specified context of use, while paying particular attention to the diversity of the capabilities within the user population, and thus aims to minimise the differences in usability experienced by individuals.