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We’ve written extensively about the System Usability Scale (SUS). It’s the most widely used and cited questionnaire for measuring the perception of the user experience. But likely the second most widely used and cited questionnaire, with over 2,000 citations, is the Post Study System Usability Questionnaire (PSSUQ). It also goes by the name of Computer System Usability Questionnaire (CSUQ). MeasuringU Press is proud to have

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In an earlier article, we reviewed five competing models of delight. The models differed in their details, but most shared the general idea that delight is composed of an unexpected positive experience. Or, for the most part, delight is a pleasant surprise. However, there is disagreement on whether you actually need surprise to be delighted. And if you don’t need surprise, then delight is really

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The NASA TLX is a multi-item questionnaire developed in 1980 by Sandra Hart. NASA is, of course, the US-based space agency famous for the one giant leap for mankind. The TLX stands for Task Load Index and is a measure of perceived workload. If you conduct mostly digital UX research for consumers (websites and software), you may not have used the NASA TLX, but as interfaces

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When done well, surveys are an excellent method for collecting data quickly from a geographically diverse population of users, customers, or prospects. In an earlier article, I described 15 types of the most common rating scale items and when you might use them. While rating scales are an important part of a survey, they aren’t the only part. Another key ingredient to a successful survey

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What does 4.1 on a 5-point scale mean? Or 5.6 on a 7-point scale? Interpreting rating scale data can be difficult in the absence of an external benchmark or historical norms. A popular technique used often by marketers to interpret rating scale data is the so-called “top box” and “top-two box” scoring approach. For example, on a 5-point scale, such as the one shown in Figure

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How satisfied are you with your life? How happy are you with your job or your marriage? Are you extroverted or introverted? It’s hard to capture the fickle nature of attitudes and constructs in any measure. It can be particularly hard to do that with just one question or item. Consequently, psychology, education, marketing, and user experience have a long history of recommending multiple items

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Many researchers are familiar with the SUS, and for good reason. It’s the most commonly used and widely cited questionnaire for assessing the perception of the ease of using a system (software, website, or interface). Despite being short—10 items—the SUS has a fair amount of redundancy given it only measures one construct (perceived usability). While some redundancy is good to improve reliability, shorter questionnaires are

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There isn't a usability thermometer to tell us how usable an interface is. We observe the effects and indicators of bad interactions then improve the design. There isn't a single silver bullet technique or tool which will uncover all problems. Instead, practitioners are encouraged to use multiple techniques and triangulate to arrive at a more complete set of problems and solutions. Triangles of course have

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There is a long tradition of including items in questionnaires that are phrased both positively and negatively. This website was easy to use. It was difficult to find what I needed on this website. The major reason for alternating item wording is to minimize extreme response bias and acquiescent bias. However, some recent research[pdf] Jim Lewis and I conducted found little evidence for these biases.

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