Turns out the missile alert system *did* ask if employee was sure: https://www.nytimes.com/2018/01/13/us/hawaii-missile.html … But asking "are you sure?" is bad UI. Most of the time the user thinks they *are* sure because otherwise they wouldn't have clicked the button in the first place! (1/2)https://twitter.com/The_Cashcow/status/952272802580779008 …
Type out is almost always the right choice. And not typing "yes" but a phrase including the action to be performed, like "discard changes" or "delete".
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You should also have to type the name of the object you're acting upon. e.g. GitHub makes you type name of the repo you want to delete.
Thanks. Twitter will use this to make your timeline better. UndoUndo
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"Undo window" is almost always the wrong answer, because a panicking user is likely to lose the context where the undo button is offered. See: Android gallery swipe-to-delete.
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Good point about losing context, though I think that's an argument for making undo action more obvious, rather than giving up on undo entirely. Of course, that's challenging on mobile where UI space is limited, which leads to atrociously unobvious UI like shake-to-undo.
End of conversation
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