Defect Removal Efficiency

Defect Removal Efficiency (DRE) allows the development team to eliminate bugs before release. DRE is calculated as the correlation of bugs detected internally (by testers and software testing) with the amount of bugs that were detected externally (by users).

DRE’s formula:  DRE= (Number of defects found internally/ Number of defects found internally + Number of defects found externally) × 100.