很显然，一项活动的惟一性越强，其历时估算越不确定，由此在控制中项目的风险也越大。
It seems clear, however, that the more unique an activity is, the less certain the estimate of its duration and, therefore, the more risky the project will be in terms of control.
一个项目经理通过计算项目组成员提供的活动历时估算的加权平均值来得到活动历时。
A project manager obtains weighted average duration estimates from the team to aciculate activity duration.
CPM的活动历时估算通常以历史数据为基础，并且采用以往项目活动历时的平均值。
With CPM, estimates of activity durations are based on historical data and are assumed to be the mean or average time that the activity has taken to perform in the past.
CPM的活动历时估算通常以历史数据为基础，并且采用以往项目活动历时的平均值。
With CPM, estimates of activity durations are based on historical data and are assumed to be the mean or average time that the activity has taken to perform in the past.
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