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Software entropy
A work on software engineering by Ivar Jacobson et al.
〔
〕
describes software entropy as follows:
:The second law of thermodynamics, in principle, states that a closed system's disorder cannot be reduced, it can only remain unchanged or increased. A measure of this disorder is entropy. This law also seems plausible for software systems; as a system is modified, its disorder, or entropy, always increases. This is known as software entropy.
:Within software development, there are similar theories; see Lehman (1985),〔
〕 who suggested a number of laws, of which two were, basically, as follows:
:# A computer program that is used will be modified
:# When a program is modified, its complexity will increase, provided that one does not actively work against this.
Andrew Hunt and David Thomas use Fixing Broken Windows as a metaphor for avoiding software entropy in software development.〔
– Item 4 (of 22 tips) is ''Don't Live with Broken Windows''.〕
The process of code refactoring can result in stepwise reductions in software entropy.
Software entropy is increased with accumulation of technical debt.
== See also ==
* Software bloat
* Software brittleness
* Software rot
* Technical debt
* Normalized Systems
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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