System Usability Scale

Definition

<a href="http://en.wikipedia.org/wiki/System_Usability_Scale">System Usability Scale (SUS)</a> yields a single number representing a composite measure of the overall usability of the system being studied. Note that scores for individual items are not meaningful on their own. To calculate the SUS score, first sum the score contributions from each item. Each item's score contribution will range from 0 to 4. For items 1,3,5,7,and 9 the score contribution is the scale position minus 1. For items