Abstract
Software maintenance accounts for up to 90% of software lifecycle effort. Software maintenance activities are re-classified into five categories. Reasons for high maintenance costs are described for each maintenance type. Several techniques to reduce current and future maintenance are described and compared. Current maintenance techniques for program browsing, software documentation, and program analysis as well as commercially available computer-aided software maintenance tools are described. Techniques to improve software maintainability, such as software re-structuring, re-engineering, reverse engineering, and defensive programming approach, and techniques to increase the maintenance productivity of future programs are described. Selection criteria in choosing these maintenance techniques and some recommendations for maintenance organization are discussed.
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