The most important contributor to the quality of software-intensive systems is the quality of the software components. The most important single metric for software quality is that of defect removal efficiency (DRE). The DRE metric measures the percentage of bugs or defects found and removed prior to delivery of the software. The current U.S. average in 2011 is only about 85% of total defects removed. However, best in class projects can top 99% in defect removal efficiency. High levels of DRE cannot be achieved using testing alone. Pre-test inspections and static analysis are necessary to top 95% in defect removal efficiency.
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