Helpful messages are helpful, especially when they show up in helpless situations. You are stuck in a lift. There is a fire accident and then you see this signage inside the lift. The signage says, Do not use lift in event of fire. It's a decent message. Fair enough.
BUT...
What use is this signage for someone inside the lift? What can the person do to get out of the lift safely? Can he save himself, solely based on the advice in this signage?
Of course, not!
Forgiving designs note that people might be caught in unwarranted situations and advise accordingly.
How forgiving are your designs?
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