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(I)  Can you explain Number of defects measure?

Number of defects is one of the measures used to measure test effectiveness. One of the side effects of number of defects is that all bugs are not equal. So it becomes necessary to weight bugs according to there criticality level. If we using Number of defects as the metric measurement following are the issues:-

• Number of bugs that originally existed significantly impacts the number of bugs discovered, which in turns gives a wrong measure of the software quality.

• All defects are not equal so defect should be numbered with criticality level to get the right software quality measure.

Below are three simple tables which show number of defects SDLC phase wise, module wise and developer wise.

Figure: - Number of defects phase wise

Figure: - Number of defects module wise.

Figure: - Number of defects

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