自下而上估算方法是指估算单个工作包或细节最详细的活动的成本，然后将这些详细的成本汇总到更高层级估算的方法，下面关于该方法的描述中（ ）是错误的。
- A.其精确性取决于估算对象的规模和复杂程度
- B.便于报告和跟踪
- C.适于对项目情况了解较少时采用
- D.该估算方法的准确性通常高于其他估算方法
正确答案及解析
正确答案
解析
自下而上估算这种技术是指估算单个工作包或细节最详细的活动的成本，然后将这些详细的成本汇总到更高层级，一般用于报告和跟踪。自下而上估算成本的方法，其准确性取决于单个活动或工作包的规模和复杂程度。一般地说，需要投入量较小的活动，其活动成本估算的准确性较高。送分题。因为，当“对项目情况了解较少时”（选项C），就无法得到项目的各个工作包，当然也就无法使用自下而上的估算方法。
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