Considerations when using a SUS

If you are considering using a SUS, keep the following in mind:

• The scoring system is somewhat complex
• There is a temptation, when you look at the scores, since they are on a scale of 0-100, to interpret them as percentages, they are not
• The best way to interpret your results involves “normalizing” the scores to produce a percentile ranking
• SUS is not diagnostic - its use is in classifying the ease of use of the site, application or environment being tested