| Type of ActivityWBS Element A type of activity usually used to break down the project scope
into smaller pieces. You can define work for a work-break-down structure
element. You can aggregate the costs from control accounts or work packages.
You cannot book costs on this activity type. Control Account The only type of activity that can be linked to an organization
breakdown structure. At this level functional responsibility for work and costs
can be assigned. You can detail control accounts using work
packages. Planning Package Planning packages are identified during planning to time phase
major activities within a control account. You cannot have a bottom-up budget
or book costs on this activity type. Work Package A type of activity. You can detail short-span jobs in work
packages and use it for the execution of a project. Milestone An activity of zero duration that usually represents a
significant event in the project. In many cases the completion of a phase or a
major deliverable. Milestones can be used for the moment of invoicing and the
calculation of earned value.
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