The Four Corners Of Usability Measurement

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

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Are both positive and negative items necessary in questionnaires?

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

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Do Users Fail A Task And Still Rate It As Easy?

Have you ever watched a user perform horribly during a usability test only to watch in amazement as they rate a task as very easy to use? I have, and as long as I’ve been conducting usability tests, I’ve heard of this contradictory behavior from other researchers. Such occurrences have led many to discount the

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