Chapter Twenty-One
| Adaptive maintenance | Changes made to a system to evolve its functionality to changing business needs or technologies. |
| Baseline modules | Software modules that have been tested, documented, and approved to be included in the most recently created version of a system. |
| Build routines | Guidelines that list the instructions to construct an executable system from the baseline source code. |
| Configuration management | The process of assuring that only authorized changes are made to a system. |
| Corrective maintenance | Changes made to a system to repair flaws in its design, coding, or implementation. |
| Maintainability | The ease with which software can be understood, corrected, adapted, and enhanced. |
| Maintenance | The final phase of the SDLC in which an information system is systematically repaired and improved; or changes made to a system to fix or enhance its functionality. See also Adaptive maintenance, Corrective maintenance, Perfective maintenance, Preventive maintenance. |
| Mean time between failures (MTBF) | A measurement of error occurrences that can be tracked over time to indicate the quality of a system. |
| Perfective maintenance | Changes made to a system to add new features or to improve performance. |
| Preventive maintenance | Changes made to a system to avoid possible future problems. |
| System librarian | A person responsible for controlling the checking-out and checking-in of baseline modules for a system when a system is being developed or maintained. |
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