Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. In software engineering, these activities are known as software maintenance (cf. ISO/IEC 9126). The maintainability index is calculated with certain formulae from lines-of-code measures, McCabe measures and Halstead complexity measures. The measurement and track maintainability are intended to help reduce or reverse a system's tendency toward "code entropy" or degraded integrity, and to indicate when it becomes cheaper and less risky to rewrite the code instead to change it.

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