Best practices for System Usability Scale (SUS) Scoring

1. What is an acceptable SUS score?
2. How many responses do you need for SUS?

What is an acceptable SUS score?

Based on research, a SUS score above a 68 would be considered above average and anything below 68 is below average, however the best way to interpret your results involves “normalizing” the scores to produce a percentile ranking.

How many responses do you need for SUS?

The SUS is a 10 item questionnaire with 5 response options. I think that I would like to use this system frequently.