9.3 Software maintenance
Software maintenance is the general process of changing a system after it has been delivered. The term is usually applied to custom software, where separate development groups are involved before and after delivery. The changes made to the software may be simple changes to correct coding errors, more extensive changes to correct design errors, or significant enhancements to correct specification errors or to accommodate new requirements. Changes are implemented by modifying existing system components and, where necessary, by adding new components to the system.
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