Defect Removal effectiveness

Defect Removal Effectiveness (or efficiency as used by some writers) is calculated as:

DRE = Defects removed during a development phase/ Defects latent in the product at that phase x 100%

Since the latent defects in a software product is unknown at any point in time, it is Approximated by adding the number of defects removed during the phase to the number of defects found later (but that existed during that phase).

Defect Removal Effectiveness can also be calculated for the entire development cycle to examine defect detection efforts before the product is released to the field. According to Capers Jones, world class organizations have Development DRE greater than 95%.
Development DRE = (Pre-release Defect) / (Total Defects) x 100% = X%
The longer a defect exists in a product before it is detected, the more expensive it is to fix knowing the DRE for each phase can help an organization target its process improvement efforts to improve defect detection methods where they can be most effective. Future DRE measures can then be used to monitor the impact of those improvement efforts.

More details can be read from here


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