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Software modernization : ウィキペディア英語版
Software modernization
Legacy modernization, or software modernization, refers to the conversion, rewriting or porting of a legacy system to a modern computer programming language, software libraries, protocols, or hardware platform. Legacy transformation aims to retain and extend the value of the legacy investment through migration to new platforms.〔Gardner, D: "Not just a nip and tuck, application modernization extends the lifecycle of legacy code assets”, () ''ZDNet'', October 24, 2006〕
== Strategies ==

Legacy system modernization is often a large, multi-year project. Because these legacy systems are often critical in the operations of most enterprises, deploying the modernized system all at once introduces an unacceptable level of operational risk. As a result, legacy systems are typically modernized incrementally. Initially, the system consists completely of legacy code. As each increment is completed, the percentage of legacy code decreases. Eventually, the system is completely modernized. A migration strategy must ensure that the system remains fully functional during the modernization effort.
Making of software modernization decisions is a process within some organizational context. “Real world” decision making in business organizations often has to be made based on “bounded rationality”.〔(Simon’s Bounded Rationality. Origins and use in Economic Theory )〕 Besides that, there exist multiple (and possibly conflicting) decision criteria; the certainty, completeness, and availability of useful information (as a basis for the decision) is often limited.

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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