Defect Removable Efficiency

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The Defect Removable Efficiency (DRE) is the percentage of defects that have been removed during an activity, computed with the equation below:
DRE = (Number of Defects Removed / Number of Defects at Start of Process) * 100
The DRE can also be computed for each software development activity and plotted on a bar graph to show the relative defect removal efficiencies for each activity. Or, the DRE may be computed for a specific task or technique (e.g. design inspection, code walkthrough, unit test, 6 month operation, etc.)
We can also calculate DRE as:
DRE = A / (A+B)
where A = Defects by raised by testing team and B = Defects raised by customer
If dre <=0.8 then good product otherwise not.
Also See: some more Software Testing Metrics:
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3 comments:

  1. is DRE also called as Defect density

    ReplyDelete
  2. no, that is a separate metric

    ReplyDelete
  3. If dre <=0.8 then good product otherwise not. (WRONG)
    If dre >=0.8 then good product otherwise not. (CORRECT!)

    ReplyDelete

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