System Usability Scale

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The System Usability Scale (SUS) is a simple and technology-independent questionnaire to evaluate the usability of a system. It is an established method for the quantitative analysis of usability. It comprises 10 questions on the Likert scale . It was developed by John Brooke in 1986.

method

A usability test is often carried out before the system usability scale so that the test persons can then evaluate the system directly. The SUS is technology-independent and therefore easy to carry out - due to the small number of questions, the assessment is also relatively quick.

Since the subjectively perceived usability is evaluated in points in the System Usability Scale, a global evaluation can be derived from it by questioning several users of the system. The SUS scale is a percentile interpretation that ranges from 0-100. A value of 68 (or higher) applies as a guide value for a system with at least good usability, 100 symbolizes perfect usability.

The global value of the survey with the help of the SUS for a system also enables a comparison to other systems or classification into quality categories. However, the value only indicates whether there are usability problems; not exactly what the problems are.

Questionnaire

Brooke suggests questions to evaluate:

  • I can very well imagine using the system regularly.
  • I find the system unnecessarily complex.
  • I find the system easy to use.
  • I think I would need tech support to use the system.
  • I find that the various functions of the system are well integrated.
  • I find there are too many inconsistencies in the system.
  • I can imagine that most people learn to master the system quickly.
  • I find the operation to be very cumbersome.
  • I felt very safe using the system.
  • I had to learn a lot of things before I could work with the system.

Depending on the area of ​​application, the questions can and should be adapted.

Individual evidence

  1. ↑ Matthias Rauer: Quantitative Usablility analysis with the System Usability Scale (SUS) (2011): Seibert Media blog. Retrieved July 4, 2015.
  2. ↑ Brooke, J .: SUS: a "quick and dirty" usability scale . In: PW Jordan, B. Thomas, BA Weerdmeester, & AL McClelland (Eds.): Usability Evaluation in Industry . London: Taylor and Francis, 1996, ISBN 978-0748404605 .
  3. ↑ Meike Schröder: The System Usability Scale In: UseTree - Berlin competence center for usability measures. Retrieved July 4, 2015.