What Is the System Usability Scale (SUS) and What Is It Used for?

by | Jul, 2019

While a professional audit is important in the process of making a website accessible, community engagement can help uncover a great deal more. When engaging your user community, the SYSTEM USABILITY SCALE (SUS) is a simple, yet reliable system for measuring accessibility.

The SUS is a scale that measures the results from an information-gathering tool consisting of a set of 10 statements. Each statement has a choice of five responses ranging from “Strongly Agree” to “Strongly Disagree.” The SUS is widely used to evaluate the usability of computer-related products and services and was created in 1986 by John Brooke. It is now an industry standard and is often referenced in written publications.

The SUS is a quick and effective tool used to score users’ opinions of a system’s ease of use, effectiveness, efficiency, satisfaction, and overall compatibility. Some of the evaluation questions refer to perceived complexity, opinions of system functions, and confidence in the system.

Scores are calculated in a marginally complex manner and then converted to a number. The scores are between 0 and 100, and research has shown that a 68 is considered average.

To learn more about the System Usability Scale’s benefits, considerations, scoring, and more, visit System Usability Scale (SUS).