2019.8.12每日一题：
You and and your team have just created a schedule network diagram.You have come up with the estimates and have defined the durations and subsequently have identified the Critical Path.You now decide to do a ‘Backward Pass’ through the Schedule Network Diagram - what would you be calculating ?
A. The Early Start and Early Finish for each activity
B. The Late Start and Late Finish for each activity
C.The duration of the other paths
D. The duration of the critical path
你和你的团队刚刚创建了一个进度网络图。你已经提出了估算并定义了持续时间，随后确定了关键路径。你现在决定通过进度网络图执行“逆推法”，下面哪项是正确的算法？
A.每项活动的最早开始和最早完成
B.每项活动的最晚开始和最晚完成
C.其他路径的持续时间
D.关键路径的持续时间
参考答案：B
解析：选项C和D不正确，因为逆推法不用于计算持续时间。事实上，根据持续时间计算关键路径。选项A谈及早期开始和早期完成，这是使用“顺推法”。使用“逆推法”是我们计算进度网络图中所有活动的最晚开始时间和最晚结束时间。参考PMBOK210。