The increasing emphasis on quality software has prompted the need for better software quality management using data-driven and statistical methods. Various measures of development and released software quality have been created to make the process measurable, repeatable, and continuously improving. In this article, the author discusses the Defect Removal Efficiency (DRE) metrics. By extrapolating the DRE metrics to released products, an organization can measure the effectiveness of their quality assurance process based on the number of defects found in the product before and after its release.