SUS

Abbreviation for System Usability Scale, a ten-item questionnaire developed by John Brooke in 1986 that produces a single usability score from 0 to 100 based on user ratings of agreement with statements about a system. SUS is widely used in accessibility and HCI research because it is short, technology-agnostic, and well-validated; scores above roughly 68 are generally considered above average, and scores of 80 or higher indicate excellent usability.