Score

System usability scale example

System usability scale example
  1. What is a good system usability scale?
  2. What does the SUS score measure?
  3. How many respondents are needed for SUS?

What is a good system usability scale?

What is a Good SUS Score? The average SUS score from all 500 studies is a 68. A SUS score above a 68 would be considered above average and anything below 68 is below average.

What does the SUS score measure?

The System Usability Scale (SUS) provides a “quick and dirty”, reliable tool for measuring the usability. It consists of a 10 item questionnaire with five response options for respondents; from Strongly agree to Strongly disagree.

How many respondents are needed for SUS?

Technically you need at least two users to have some measure of variability (the standard deviation) and to generate confidence intervals. We have never done a test using the SUS with only two users. We will, however, report the SUS score with just five users.

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