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<p>maintenance may include rewriting <a href="page.php?w=software_documentation">documentation</a>, <a href="page.php?w=code_refactoring">code refactoring</a>, and performance tuning.According to some estimates, enhancement (the latter two categories) comprises some 80 percent of software maintenance.</p>

<p><big>Maintainability</big></p>
<p>Maintainability is the quality of software enabling it to be easily modified without breaking existing functionality. According to the  ISO/IEC 14764 specification, activity to ensure software maintainability prior</p><p>
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