What does UI stand for?
AnswerUser interface
The UI is the part of a system people see and interact with.
Tech · Facts & stats
UI facts & stats
7 fact-checked facts about user interface design and usability, each with the reason behind it. 5 more are in today's round and join this page after it closes.
The basics
What does UX stand for?
AnswerUser experience
UX covers the whole experience of using a product.
Going deeper
Which research center developed the Alto, an early computer with a graphical interface?
AnswerXerox PARC
The Xerox Alto from the 1970s influenced later GUIs.
Who demonstrated the computer mouse in the 1968 'Mother of All Demos'?
AnswerDouglas Engelbart
Engelbart's demo showed the mouse, hypertext and more.
Fitts's law predicts what?
AnswerHow long it takes to point at a target based on its size and distance
Bigger, closer targets are faster to hit.
Expert level
Hick's law says what increases as the number of choices grows?
AnswerDecision time
More options mean users take longer to choose.
Under WCAG level AA, what is the minimum contrast ratio for normal body text?
Answer4.5:1
Level AA requires 4.5:1 for normal text and 3:1 for large text.
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