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(I) Can you explain DRE?

DRE(defect removal efficiency) is a powerful metric to measure test effectiveness. From this metric we come to know how many bugs we found out from the set of bugs which we could have found. Below is the formula for calculating DRE. So we need two inputs for calculating this metric number of bugs found during development and number of defects detected at the end user.

Figure:-DRE formulae

But success of DRE depends on lot of factors. Below are listed some factors:-

• Severity and distribution of bugs must be taken in to account.
• Second how do we confirm when the customer has found all the bugs. This is normally achieved by looking at the past history of the customer.

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