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My question is this: How much margin, if any, should I allow for and where in the calculation should I add it? An error bar makes no sense for individual SUS scores. Presenting grouped average scores then displaying a standard deviation for each group would be sensible. If you're worried about the audience for the results reading too much into small ...


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Because SUS works very well and has been examined closely practitioners for more than 25 years. The SUS questions weren't pulled out of a hat. They were research based. To somewhat extensively quote from Brooke's original paper: SUS is a Likert scale. It is often assumed that a Likert scale is simply one based on forced-choice questions, where a ...


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I guess people like the SUS because it is something well-known and off-the-shelf, in the sense that you can pretty much use it as is or make slight modifications and adapt it to your purpose. SUS has the characteristic that it is generic and can be applied to a lot of different types of products and services, so it is good for comparisons across different ...



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