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Five Core Metrics: The Intelligence Behind Successful Software Management by Lawrence H. Putnam, Ware Myers

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Chapter 8. Defect Rate Measures Reliability

“What in the world do they mean by that title?” John asked, looking up from a draft copy of this chapter.

“They mean you can count defects,” Phil replied. “You can count the number of defects you find every week. That is the defect rate. You might like to count quality, but you can’t. There are too many aspects of quality that are not countable. But reliability is one of those aspects, and you can count defects to measure it.”

Quality in software is the outcome of meeting the goals, requirements, and actual needs of the users. It is a positive concept, referring to such qualities as integrity, interoperability, flexibility, maintainability, portability, expandability, reusability, resilience, and usability. ...

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