the extent to which time or effort is well used for the intended task or purpose

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Effect of an image avatar on user's work with comments

I am searching for some study about what is an effect of avatar images in discussion. It is definitely true, that comment with avatar image is better for user's recognition and orientation inside many ...
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Using mixed radio and checkbox buttons - is there any efficiency or usability gain in the design?

I have noticed that many online forms and surveys these days are starting to use a mixture of radio and checkbox buttons for the same question, that is, for a question that gives the person a number ...