Design effective error messages by ensuring they are highly visible, provide constructive communication, and respect user effort.| Nielsen Norman Group
Reduce input effort for fields with values that vary little from the default by allowing users to increase or decrease the number in a single button press.| Nielsen Norman Group
Teens are (over)confident in their web abilities, but they perform worse than adults. Lower reading levels, impatience, and undeveloped research skills reduce teens' task success and require simpler sites.| Nielsen Norman Group