In software development, productmaintenance is most likely managed as an entirely separate project.
在软件开发中，产品维护通常是被作为一个完全分开的项目来进行管理的。
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Installations of software tend to take months, maintenance costs more than the original product price, and unexpected delays and down time result in a massive drop in productivity.
As the most costly and complex phase in softwareproduct 's life cycle, softwaremaintenance has a direct and important effect on the quality and reliability of software products.