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Is a Single Item Enough to Measure a Construct

Questionnaires

by Jeff Sauro, PhD | March 13, 2018

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Is a Single Item Enough to Measure a Construct?

By Jeff Sauro, PhD . March 13, 2018 . Tags: , ,
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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Measuring Usability: From the SUS to the UMUX-Lite

By Jeff Sauro, PhD . October 10, 2017 . Tags: , ,
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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The Four Corners Of Usability Measurement

By Jeff Sauro, PhD . August 16, 2011 . Tags: , , ,
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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Are both positive and negative items necessary in questionnaires?

By Jeff Sauro, PhD . April 26, 2011 . Tags: ,
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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