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I emphasize that virtually every engineering calculation is ultimately a failure calculation, because without a failure criterion against which to measure the calculated result, it is a meaningless number.

Henry Petroski
Engineering, Numbers, Criteria
"ASK OCE Interview: Five Questions for Dr. Henry Petroski". ASK OCE Interview, appel.nasa.gov. February 26, 2010.
I emphasize that virtually every engineering calculation is ultimately a failure calculation, because without a failure criterion against which to measure the calculated result, it is a meaningless number.