软件生存周期
software lifecycle
中文定义
指软件产品从开始构思到产品不再被使用为止的一个时间周期。软件 生存周期通常包括概念阶段、需求阶段、设计阶段、实现阶段、测试 阶段、安装和验收阶段、运行和维护阶段，有时还包括退役阶段。这 些阶段可重复或被迭代。
English Definition
The period of time that begins when a software product is conceived and ends when the software is no longer available for use. The software lifecycle typically includes a concept phase, requirements phase, design phase, implementation phase, test phase, installation and checkout phase, operation and maintenance phase, and sometimes, retirement phase. Note these phases may overlap or be performed iteratively.