A rigorous initial analysis and planning phase is capable of producing enough parametric data to feed the algorithmic methods, such as COCOMO and the Software Lifecycle Model (SLIM).

严格的初始分析和计划阶段有能力产生足够的参数化的数据，以支持基于算法的方法，比如COCOMO和Soft ware Lifecycle Model (SLIM)。

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Still, few software projects perform as planned; initial as well as later estimates tend to be way off, demanding frequent re-planning, which unfortunately also tends to be overly optimistic.

尽管如此，很少有软件项目按照计划执行；最初的和后来的评估都会走样，我们需要频繁的中心制定计划，不幸的是这些计划往往也都过于乐观。

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