One of my friends was talking about the term/metric ‘Defect Detection Capability’. He was saying that calculating this metric and taking necessary steps to increase it, will improve test productivity. Well he was telling me that ‘Defect Detection Capability’ is how many defects a tester can find in a given amount of time, I will not agree this. How can we calculate testers efficiency by number of defects found. Is it a good practice? Is there any principle which states that each tester can find these many defects in a given time. No one can say how many defects can be found before testing. A tester cannot find same number of defects everyday he tests. The application may be stable after some time, at this time will you expect a tester to find the same number of defects that he/she have found earlier? Testing is always context dependent.
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