Using the SUS Questionnaire to Evaluate Subjective Satisfaction with Handsets in Out-of-the-box Testing by Sven Koerber, SirValUse, GmbH (Germany)

Based on the results of 27 quantified usability tests of mobile phones, usability professionals from UXalliance partner SirValUse GmbH (Germany) are able to provide data points based on this research. The data points provide an understanding of what to expect from SUS (System Usability Scale) questionnaires in walk-up-and-use testing.

Created in December 1986 for the evaluation of office systems, SUS continues to be valuable. This one-page, ten-item questionnaire written by Sven Körber, Director Customer Experience, SirValUse GmbH has proven a useful and consistent tool to capture subjective satisfaction with mobile phones, even with small samples and when time is short in sessions. As a rule of thumb, scoring higher than 70 on a scale from 0-100 can be interpreted as providing relatively high perceived usability for mobile phones.

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