The term comes from the old milestone markers that let travelers know how close they were to their goals.

A milestone is "a significant point or event in a project."[1]

Milestones are tracked on a milestone list. A milestone list is developed as an output of the PMI process to define activities and is then an input to sequence activities. A milestone list or timeline can provide a good overview of the project and its major events and deliverables

Related: schedule


  1. PMBOK, 5th edition, section

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