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defect / fault / failuredefect / fault / failurePosted Jul 11, 2008 17:01 UTC (Fri) by giraffedata (subscriber, #1954)In reply to: defect / fault / failure by zooko Parent article: Dan Kaminsky Discovers Fundamental Issue In DNS: Massive Multivendor Patch Released (Securosis.com)
fault -- an incorrect step, process or data definition in a computer program ( Reference : ISO/IEC JTC1/SC7:14598-1) This is a pretty bad definition; it doesn't capture the essential difference between a defect and a fault as the terms are commonly used and as used in the other references. There's a simple distinction: a defect is a state and a fault is an event. If my email sending program doesn't check the divisor for 0 before dividing by it, that's a defect in the program. Each time I run the program and it crashes because it divides by zero, that's a fault in my sending of the email. If I don't have some way to recover and get the email out anyway, it's also a failure in my sending of the email.
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