活动用来：排序，估算时间，制定进度计划
实际你项目管理的时候，也要管理到活动层面的
WBS最底层就是工作包
活动是动词
工作包是名词
活动是工作包的子集
一个工作包会有一到多个活动。
Work Package Definition
The work defined at the lowest level of the work breakdown structure for which cost and duration can be estimated and managed.
Work packages are smallest deliverable in a project. They are reside at the lowest level of a WBS.
A Work Package
is smallest level of deliverable.
is lowest component of a WBS.*
cannot be broken down further. It cannot be decomposed into a smaller level deliverable.
provides some tangible value to the project stakeholder(s).
is recognized, required and valued by the project Stakeholder(s).
gives a sense of fulfillment & achievement to the project team.
provides satisfaction to the the project Stakeholder(s). It is handed over to the project Stakeholder(s), once it is created.
Activity Definition
A distinct, scheduled portion of work performed during the course of a project.
A work package is further decomposed into a sequence of activities. An activity in itself does not produce a deliverable but a sequence of activities culminates into a deliverable.
In simple terms we can say that series of activities creates a Work Package. An Activity, in itself, may not produce any tangible outcome but a series of Activities would result into a deliverable.
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