The System Usability Scale (SUS)

Summary: The SUS is a well-established 10-question survey administered at the end of a user test; it gives you a measure of the perceived usability of your product and enables you to compare it with others.

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Beyond the NPS: Measure Perceived Usability with the SUS, NASA-TLX, and the Single Ease Question

Post-test questionnaires like the SUS measure perceived usability of an entire system; post-task scales suggest problematic parts of a design.

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Raluca Budiu is Senior Director, Data Strategy, at Nielsen Norman Group, where she uses her data-analysis expertise to drive strategic decisions. She also serves as editor for the articles published on NNgroup.com. Raluca has coauthored many NN/g reports, as well as the book Mobile Usability. She holds a Ph.D. from Carnegie Mellon University.

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