Benchmarking is an important tool for Usability People.

It can be used to measure improvement from version A to version B of a product, and to compare one product against another.

As part of our formal usability studies, we include the results several standardized user satisfaction scales to benchmark user satisfaction to other products.

One such scale is the System Usability Scale (SUS). The SUS is a simple, 10-item Likert-type attitude scale providing a global subjective assessment of usability from the user’s perspective (John Brooke at Digital Equipment Company developed the SUS in 1986). The SUS scale is scored from 0 to 100. Scores under 60 represent systems with poor usability, scores over 80 are considered better than average.

SUS scale used for benchmarking user satisfaction