UXtweak

What are the main limitations of the SUS score questionnaire?

1. The SUS score is not diagnostic. While it gives you a clear usability score, it won’t tell you exactly what’s wrong with your product. For that, you need usability testing.

2. Sample size matters. Since SUS represents quantitative data, you should have at least 20 to 30 responses to ensure your results are statistically significant.

3. Timing is everything. Administer the SUS questionnaire right after users interact with your product. Their experience should be fresh in their minds for the most accurate feedback.

4. Don’t modify the questions. Changing the wording can affect the reliability of your results, so stick with the original 10 statements.

5. SUS is best for benchmarking. A single SUS score can be useful, but tracking the SUS score over time or comparing it to competitors gives you much more valuable insights.

Learn how to calculate and interpret the SUS score on YouTube - link in BIO

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