survey methodology is the field that studies the sampling of individuals from a population with a view towards making statistical inferences about the population using the sample.

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How to measure self reported computer proficiency? Ideally with one item

For a usability test, I'd like to have a simple measure for computer proficiency, to be able to see, whether it has an impact on successfully handling the tasks. How can we best measure that? A ...
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Information density vs. number of pages for users with low computer literacy

Any suggestions for design patterns/best practices regarding less pages/higher info density vs. more pages/less info density when your audience has low-level computer literacy? The particulars: I'm ...