Defect Removal Efficiency (DRE) - Metric

Defect Removal Efficiency (DRE)

Description
This metric will indicate the effectiveness of the defect identification and removal in stages for a given project

Formula
· Requirements: DRE = [(Requirement defects corrected during Requirements phase) / (Requirement defects injected during Requirements phase)] * 100

· Design: DRE = [(Design defects corrected during Design phase) / (Defects identified during Requirements phase + Defects injected during Design phase)] * 100

· Code: DRE = [(Code defects corrected during Coding phase) / (Defects identified during Requirements phase + Defects identified during Design phase + Defects injected during coding phase)] * 100

· Overall: DRE = [(Total defects corrected at all phases before delivery) / (Total defects detected at all phases before and after delivery)] * 100

Metric Representation
Percentage

Calculated at
Stage completion or Project Completion

Calculated from
Bug Reports and Peer Review Reports