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How Useful Is the System Usability Scale (SUS) in UX Projects?

Summary: SUS is a 35-year-old and thus well-established way to measure user satisfaction, but it is not the most recommended way of doing so in user research.

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https://www.youtube.com/watch?v=6b2YFgRCVDE

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Beyond the NPS: Measuring Perceived Usability with the SUS, NASA-TLX, and the Single Ease Question After Tasks and Usability Tests

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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Jakob Nielsen, Ph.D., is a retired principal and co-founder (with Dr. Donald A. Norman) of the Nielsen Norman Group. Jakob established the "discount usability engineering" movement for fast and cheap improvements of user interfaces and invented the heuristic evaluation method.

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