Ad Hoc vs. Planned Software Maintenance
نویسنده
چکیده
In a series of papers, Belady and Lehman [Belady & Lehman, 1976] pioneered the study of the evolution of software. They observed that over time, programs exhibit increasing entropy. As a program evolves, its structure degrades and its size increases, resulting in increased complexity. The increase in program entropy as it evolves makes program maintenance increasingly more difficult, and will ultimately result in the program dying and being replaced by another program, or the program undergoing a major and expensive overhaul. When making a modification to a piece of production software, a maintenance programmer must give some thought to the impact their changes will have on the entropy of the module.
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