Tracing it to its cause, software test management is very important during the life cycle of whole software.

究其原因，软件测试管理在整个软件生命周期中举足轻重。

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Then, tracing to its source, explains the economics theoretical foundation of the consumer credit, that is, time-favor theory, life-cycle hypothesis and permanent-income theory.

而后追根溯源，阐释了消费信贷的经济学理论基础，即时间偏好理论、生命周期假说和持久性收入假说。

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The life cycle of software problem is discussed in depth, the State control and change tracing of software problem providing the foundation for the management of software problem is presented.

文章深入讨论了软件问题的生命周期，指出软件问题的状态控制与变更追踪构成了软件问题管理的基础。

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