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由于软件具有可见性差、定量化难等特殊性,因此很难在项目完成前准确地估算出开发软件所需的工作量和费用。其中,估算源代码行数时,可以请n位有经验专家,每位专家对软件给出3个估计值:

 .ai——最少源代码行数(该软件可能的最小规模);

 .bi——最大源代码行数(该软件可能的最大规模);

 .mi——最可能的代码行数(该软件最可能的规模)。

 然后计算出每个专家的估算期望值Ei=(15),n位专家的估算期望值的平均值就是代码行数的估计值。

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