System Usability Scale

A widely used 10-item Likert scale questionnaire developed by John Brooke in 1996 that provides a quick, reliable measure of perceived usability. Scores range from 0 to 100, with higher scores indicating better usability. The SUS has been validated across thousands of studies, but its availability only in written languages has historically excluded deaf users whose primary language is a signed language, prompting efforts to create formally translated and psychometrically validated ASL and other signed language versions.