ABSTRACT
This chapter discusses types of maintenance and techniques for managing maintenance. Maintenance is the last stage in the system development life cycle and, consequently, is affected by everything that happens in the previous stages. Errors made during the analysis and design stages can significantly impact maintenance. The key to controlling maintenance costs is to design systems that are easy to change, so the link between development and maintenance is very strong. The objective of corrective maintenance is to remove errors or bugs from the software, the procedures, the hardware, the network, the data structures, and the documentation. The point of adaptive maintenance is to enhance the system by adding features, capabilities, and functions in response to new technology, upgrades, new requirements, or new problems. The point of perfective maintenance is to enhance the system by improving efficiency, reliability, functionality, or maintainability, often in response to user or system personnel requests.
