In the world of ergonomics and man-machine interface design, there is
a rule: If an action will destroy information or a state than cannot
be restored with the same effort that it took to destroy, then the
system requires either (a) a "Un-Do" function of equal simplicity, or
(b) a confirmation step.
The choice between (a) or (b) depends on the consequences of the
unintended action during the time it takes to recover. For example, a
(hypothetical!) button that shuts down the jet engines on an aircraft
requires a confirmation step... because turning off the engines until
the pilot hits UnDo would be bad!
This rule applies to software as well as hardware.
-- Eric K3NA
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