9.8.08

Defect Removal Efficiency (DRE)


A more powerful metric for test effectiveness (and the one that we recommend) can be created using both of the defect metrics discussed above: defects found during testing and defects found during production. What we really want to know is, "How many bugs did we find out of the set of bugs that we could have found?" This measure is called Defect Removal Efficiency (DRE).
The later we discover a bug, the greater harm it does and the more it costs to fix.
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