Software maintenance
Modification of a software product after delivery / From Wikipedia, the free encyclopedia
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Software maintenance in software engineering is the modification of a software product after delivery to correct faults, to improve performance or other attributes.[1][2]
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A common perception of maintenance is that it merely involves fixing defects. However, one study indicated that over 80% of maintenance effort is used for non-corrective actions.[3] This perception is perpetuated by users submitting problem reports that in reality are functionality enhancements to the system.[citation needed] More recent studies put the bug-fixing proportion closer to 21%.[4]