系统可用性量表(SUS) is a st和ardized metric for measuring the usability of a website or other interactive system. Long a favorite among UX researchers for its simplicity 和 accuracy, SUS is a valuable quantitative tool for anyone trying to optimize the user experience.

SUS uses a short, 10-item questionnaire administered at the end of a 可用性测试 计算一个网站的得分. Users respond to each question on a 5-point scale from “Strongly disagree” to “Strongly agree.” 的se answers are then used to generate an extremely reliable overall usability score for your site.


的 questionnaire consists of the following 10 items:

  • I think that I would like to use this system frequently.

  • 我发现这个系统不必要地复杂.

  • 我认为这个系统很容易使用.

  • I think that I would need the support of a technical person to be able to use this system.

  • I found the various functions in this system were well integrated.

  • I thought there was too much inconsistency in this system.

  • I would imagine that most people would learn to use this system very quickly.

  • 我发现这个系统使用起来很麻烦.

  • 我对使用这个系统很有信心.

  • I needed to learn a lot of things before I could get going with this system.

的 5-point Likert scale used for collecting responses to the SUS questionnaire
Users respond to each question using a 5-point Likert scale like this one


Based on different studies, the mean SUS score is around 68-70.5. 如果你的分数接近这个范围, you can assume that your website‘s usability is about average.

Some researchers have attempted to map adjectives like “excellent,”“可怜的,” or “worst imaginable” to different scores for an additional level of insight. 例如,71.4 (just above average) corresponds to “good”: better than an “ok” 50.9分,但低于“优秀”85分.5.


Another way to add meaning to your SUS score is to turn it into a percentile ranking. By comparing your results against hundreds or thous和s of scores collected in other usability studies, you can contextualize your site’s performance relative to the rest of the web. 例如,平均分是70分.5 is in the 50th percentile (better than half of the sites tested) according to our database of 500 网站.


Though described by its inventor as a “quick 和 dirty” measure, studies have found SUS to be among the most accurate 和 reliable of all 可用性调查,跨越样本大小. It is now one of the most popular metrics for quantifying system satisfaction, with thous和s using it to gauge user-friendliness over a wide range of products online 和 off, 特别是对于 电子商务用户体验.

All these qualities make SUS a valuable tool for st和ardizing a diverse mix of tester feedback, 并将反应聚合成有意义的, 但简洁, 用户体验图. If individual test videos are the trees, SUS shows you not only the forest, but the entire ecosystem. With a widely-trusted industry st和ard to rely on, you can take a step back from your own company 和 see how you chalk up in the broader world around you.

SUS也可以很好地配合使用 A / B测试,两个 网站移动应用程序!

See the forest through the trees with 5 FREE tests



的 SUS is the absolute baseline for all 可用性测试ing. Every product at some point in its development will have benefited from a SUS score. Unlike many other psychometrics, the SUS boasts great reliability in its relative simplicity.

Here's a list of the other psychometrics on the TryMyUI platform 和 why they might be a better alternative to the system usability scale depending on your situation.

Enabling different psychometrics on the TryMyUI 可用性测试ing platform

的PSSUQ 和 the SUS are fairy similar, widely-utilized psychometrics that have been around for decades. 的 key difference for deciding between the two comes down to your specific use-case: are you testing a very specific, scenario-based product that you already feel is usable? 如果是这样的话, PSSUQ offers much more nuance than SUS 和 could be seen as a more specialized version for a more complete product.

看看全博体育网址的深入比较: SUS和PSSUQ:量化用户体验.

采用似然因子问卷 is meant for early stage development products or to gauge a general interest in the product. 而ALFQ确实衡量了可用性的某些方面, it isn’t for sophisticated usability 和 usefulness research in the way that SUS or PSSUQ is.

杰夫Sauro’s St和ardized User Experience Percentile Rank Questionnaire 衡量的不仅仅是可用性或满意度, tapping into the heart of the user’s more abstract thoughts of a product such as trust 和 credibility. 一个值得注意的因素是品牌背景: SUPR-Q is best utilized for established companies that users are familiar with, 和 whose designs have already been through rounds of SUS 和/or PSSUQ testing to see if the designs are on-br和.

调查问卷 这是双方合作的产物吗 TryMyUI、MeasuringU和QuestionPro to address the cognitive stress 和 fatigue of survey responses on testers. SRS is an extremely specialized metric that is meant more for 市场营销 比可用性.

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