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There are 3 cases. The destructive action Do you want to delete this file? Don't. Just do the action, and display a confirmation snackbar (non-blocking small widget somewhere where it is visible but not in the way of operating) that allows to cancel (then, either delay the action, or make sure you can revert it easily). The question can only be ...


I'm a big proponent of not showing messages blocking users from doing what they intended to do. The UX solution with confirmation popups came from the Stone Age of computer UX practices. It originates from a correct assumption that if we have a critical resource, we should not let users damage it by an accident. However, an accident is called that way ...


I'm surprised nobody brought up the Mac OS X shut down dialog. It presents you with an "Are you sure?" window, but has a timer so that if the user walks away, expecting the computer to have shut down, it will while still allowing the user time to cancel.


Yes. There is a very simple, effective heuristic that adjusts to the preference of each user. Place a check box in the warning message dialog that says: Don't show this message again Which can be improved further by stating where that dialog can be reenabled.


These are Confirmation messages - Windows have a fairly detailed page on their guidelines. The whole of that page is pretty useful but here's some excerpts (emphasis mine): Confirmations are most useful when the action requires the user to make a relevant and distinct choice that can't be made later. That choice often involves some element of risk that ...

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