Error Prevention aims at avoiding the error completely. It is possible only in some specific cases and, almost without exception, requires design-based solutions.
Error Reduction aims at minimizing both the likelihood and the magnitude of the error.
Error Detection aims at making errors apparent as fast and as clearly as possible, thereby enabling recovery. An error can be:
Detected by the person that committed the error (self-monitoring), or
Cued by the environment (e.g., detected by the system hardware and software), or
Detected by another person.
Error Recovery aims at making it easy to rapidly recover the system to its safe state after an error has been committed.
Error Tolerance aims at making the system better able to sustain itself despite error, i.e. minimizing the consequences of errors.
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