DRE - Defect Removal Efficiency

January 01, 2022

Author: Daniel José da Silva

Defect Removal Efficiency

Software quality is essencial on any software project. This time we will be taking a look on DRE - Defect Removal Efficiency.

Defect Removal Efficiency is a measure of the efficacy of the software testing process in finding defects before the software is released which is calculated as:

DRE = ( E / (E + D) ) X 100


E = The number of defects found before release of the software

D = The number of defects found after release of the software

We could drill down calculating the DRE using the following areas:

  • Requirement (Inspection during the refinement/grooming)

  • Design (Inspection during the Pull Request Review, Pair Programming)

  • Build (Inspection during the Unit Testing, Pull Request Review, Static Code Analysis)

  • Testing (Inspection during the Integration, System, Regression and Manual testing)

For example if before the deployment to the client we find overall 80 defects and after the deployment the client finds 12 defects we would have:

DRE = (80 / (80 + 12)) * 100

DRE = 86.95 %

The score of 86.95% is considered above the market average of 85% (at the moment of this writing).

In short this metric shows how good the team is performing finding defects before they go to production.

Defect Removal Efficiency


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Defect Removal Efficiency