Hi,
For measuring UX, I have used Revised HED-UT scale by Heijden et al. It has 9 items for utility construct : useful, practical, necessary, functional, helpful, efficient, effective,beneficial and productive (with negative polarities on the other end). As utility is supposed to measure both usability and usefulness, is there a way I can separate usefulness from usability? Is it safe to assume that useful, practical, necessary, helpful, beneficial are measures for usefulness and functional, efficient, effective, productive are measures for usability?
I am just afraid using this method of distinguishing between usability and usefulness metrics as people might have different interpretations for different items. So I might consider an item as a measure of usability construct. But, someone else might consider that item as a subset of usefulness construct.
Thanks Leonhard. I thought about using factor analysis. But to use it, the sample size (N=30) is not sufficient as per the thumb rule (N=100). Is there any other way to do something similar with a small sample size?
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