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。
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）。
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）。
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