>I didn't say "standards", I said certification requirements. Those are,
>at least in the US, Federal Regulations, not standards. They set numerical
>requirements on rate of occurrence of dangerous failures; those are given
>qualitatively but they are assigned quantitative equivalents elsewhere
>(oddly, in the acceptable means of compliance).
I see what you mean Peter. I remain very much in the same camp as Nick with this and cannot see any way to express numerically the contribution of software errors to a Failure Condition.
In terms of Taxonomy there remains an issue within the aeronautic domains. There are still many that use error, fault and failure interchangeably.
Ross
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