Getting Good Proof Test Coverage NumbersTuesday, April 05, 2011
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Several years ago we recognized that proof test coverage was an important variable that must be considered when doing PFDavg calculations. We ran some models and discovered that the difference between “perfect” proof test coverage (100%) and a very good 90% could mean a whole SIL level in the result. The first question I ask is ‘Why do some engineers still use simplified equations that assume perfect proof test coverage?” Unfortunately the answer I get when I ask them is a question, “What is proof test coverage?” Not a good sign that those doing the work have the competency needed. But that is another topic for another blog.
Given that proof test coverage is so important, how are good numbers…