In software maintenance, it is quite common to identify another type of software change, namely Preventive changes, because code can have flaws that are not real defects but they make the software harder to maintain in the future.
In software maintenance, it is quite common to identify another type of software change, namely Preventive changes, because code can have flaws that are not real defects (they do not cause failures), but they make the software harder to maintain in the future. Preventive changes are those that improve the maintainability of a software system or reduce the potential for future failures.