主要不关注网络路线的总时差,而是集中管理缓冲活动持续时间和用于计划活动资源的制订进度计划所采用的技术是 ( ) 。
- A.关键路线法
- B.资源平衡法
- C.关键链法
- D.进度压缩法
正确答案及解析
正确答案
解析
关键链法是一种进度网络分析技术,可以根据有限的资源对项目进度计划进行调整。关键链法结合了确定性与随机性办法。开始时利用进度模型中活动持续时间的估算,根据给定的依赖关系与限制条件绘制项目进度网络图,然后计算关键路径。在确定关键路径后,将资源的有无与多寡的情况考虑进去,确定资源限制进度计划。这种资源限制进度计划经常改变项目的关键路径。关键链法在网络图中增加作为“非工作进度活动”的持续时间缓冲,用来应对不确定性。放置在关键链末端的缓冲称为项目缓冲,用来保证项目不因关键链的延误而延误。其他的缓冲,即接驳缓冲,则放置在非关键链与关键链接合点,用来保护关键链不受非关键链延误的影响。应该根据相应路径上各活动持续时间的不确定性,来决定每个缓冲的时间长短。一旦确定了“缓冲进度活动”,就可以按可能的最晚开始与最晚完成日期来安排计划活动。这样一来,关键链法就不再管理网络路径的总浮动时间,而是重点管理剩余的缓冲持续时间与剩余的任务链持续时间之间的匹配关系。
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