In my opinion, this doesn't make sense because then the detailed activity represents the same work as the prior summary activity.

我的观点是，这毫无意义，因为如此的话详细活动跟前面的摘要活动做的是一样的工作了。

youdao

A summary activity can be used as a milestone since it would indicate that all of the underlying detailed work has been completed.

活动可以用来作为里程碑，因为它可以指示所有底层的详细活动已经完成。

youdao

Your WBS should contain both detailed and summary activities. (A summary activity is one that is broken down further; a detailed activity is one that is not broken down further.)

你的WBS应当既包含详细活动也包括摘要活动（摘要活动是可以往下细分的活动，详细活动则不能再往下细分）。

youdao

The third is a Summary Activity Report.

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This is the backbone to the Summary Activity Report and displays a line item detail of every call and appointment made (and scheduled to be made) by each salesperson, what was last discussed and what next action has been scheduled.

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By definition, GDP is a summary of final sales for new goods and services and not of all economic activity.

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