A key date in the project schedule marking the completion of a major phase or deliverable.
A milestone is a significant event or point in the project schedule with zero duration that marks the completion of a major deliverable or phase, such as permit issuance, structural steel completion, building enclosure, or substantial completion. Milestone dates are often contractually required and may trigger liquidated damages if missed. They are used to monitor overall project progress at summary level.
The contract established five mandatory milestones, with the building enclosure milestone required by October 15 to allow interior work to proceed during winter.
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