在进行项目活动历时估算时，如果很难获得项目工作的详细信息，可采用（ ）作为项目活动历时估算的工具。
- A.参数式估算法
- B.类比估算法
- C.预留时间估算法
- D.历时的三点估算法
正确答案及解析
正确答案
解析
参数式估算法是指利用历史数据与其他变量之间的统计关系，来估算持续时间等活动参数。例如把需要实施的工作量乘以完成单位工作量所需的工时，即可计算出活动持续时间。
类比估算法即用以前类似项目工作的完成时间来估计当前工作的完成时间，当很难获得项目工作的详细信息时，用这种方法来估计项目工作的完成时间是一种较为常用的方法。
历时的三点估算法的特点是估计活动的最可能、最乐观以及最悲观时间，通过设置权重，运用统计规律降低历时估算的不确定性。
预留时间估算法是指不管用什么方法估计出的项目工作完成时间都不是工作的实际完成时间，出于一种谨慎的考虑，可以按照估计出的时间的一定百分比预留一些时间来作为对应急情况发生时的一种补充。
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