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Usability of a system (SUS)
Ten statements about a website, app or device you have used, scored from 0 to 100 and graded against hundreds of other products.
Your answers stay in this browser tab unless you choose to share them anonymously.
About this questionnaire
The System Usability Scale was created by John Brooke at Digital Equipment Corporation in 1986 and is the most widely used usability questionnaire in the world. It works for almost anything people use: websites, apps, devices and services.
Think of one system you have used recently, and answer each statement with your first reaction. If a statement does not apply, choose the middle point.
Scoring: each answer gives 0–4 points (odd-numbered statements: answer − 1; even-numbered: 5 − answer). The sum × 2.5 gives a score from 0 to 100. The score is not a percentage: the average across many products is 68.
Before you start
For reflection, not diagnosis. This is a self-report questionnaire. It cannot diagnose any condition, and it is not a basis for hiring, admission or any other decision about a person.
Private by default. Everything runs in your browser. Your answers are not saved or sent anywhere unless you choose, before starting, to share them anonymously for site statistics.
Provided as is. A personal project, free and with no warranty. Not connected to any institution I work with.
Credit
Brooke, J. (1996). SUS: A “quick and dirty” usability scale. In P. W. Jordan, B. Thomas, B. A. Weerdmeester & I. L. McClelland (Eds.), Usability Evaluation in Industry (pp. 189–194). Taylor & Francis. © Digital Equipment Corporation, 1986.
“SUS has been made freely available for use in usability assessment … the only prerequisite for its use is that any published report should acknowledge the source of the measure” (Brooke, 1996). Average of 68 and the curved grading scale: Sauro & Lewis, via MeasuringU (measuringu.com).