# System Usability Scale: what it is and how it works
> The System Usability Scale, or SUS, is a ten-item questionnaire used to collect a rating of perceived usability.
URL: https://www.zorraquino.com/en/dictionary/system-usability-scale

# System Usability Scale

The System Usability Scale, or SUS, is a ten-item questionnaire used to collect a rating of perceived usability

What it means, how it is used and where it comes up, with its related concepts.

[The whole glossary](https://www.zorraquino.com/en/dictionary)

## What it is and how it works

It produces a score from zero to one hundred through a specific calculation procedure. That score is not a percentage of tasks completed. It should be interpreted in context and combined with observation of use to understand what to improve.

Also known as

SUS

Topics

[Experience and service design](https://www.zorraquino.com/en/dictionary/category/experiencia-y-diseno-de-servicios)

## Related concepts

- [Usability](https://www.zorraquino.com/en/dictionary/internet/usability.html)
- [Usability testing](https://www.zorraquino.com/en/dictionary/ux/usability-testing.html)
- [Digital accessibility](https://www.zorraquino.com/en/dictionary/digital-accessibility)

## References

- [Nielsen Norman Group: measuring perceived usability](https://www.nngroup.com/articles/measuring-perceived-usability/)