Quantitative/ Measurement
System Usability Scale
Measure perceived usability with a standard scale
The System Usability Scale is a ten-item questionnaire assessing perceived usability after experience with a system. Alternating item polarity requires the standard scoring transformation, yielding a score from zero to one hundred. That score is not a percentage of users satisfied or tasks completed. Interpretation needs task, population and reference-context information alongside uncertainty.
WHEN IT FITS
Use SUS for a brief, standardised measure of perceived usability after relevant interaction, particularly when comparing versions or systems while also collecting task performance or qualitative diagnostic evidence.
Strengths
- Brief and widely studied across interactive systems
- Enables consistent perceived-usability measurement across iterations
Limitations
- A total score does not locate interface problems
- Comparisons depend on user experience, tasks and context
Know the boundary
SUS measures perceived usability, not objective task success, workload or learning gain.
USED ACROSS
Computer scienceEducationBusiness & MBA