DRE is a measure to detect defects before delivery. It is calculated as a percentage of the defects identified and corrected internally with respect to the total defects found in the complete project life cycle. Thus, DRE is the percentage of bugs eliminated by reviews, inspections, tests etc.
Our prime Goal: D.R.E. = 1.0 (100%)
For e.g.
(E1)Errors Found Before Delivery / Within Activity = 5
(E2) Errors Found After Delivery / After Activity* = 4
DRE = 5/(4+5) x100= 55%
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