Milestones are tools used in project management to mark specific points along a project timeline. These points may signal anchors such as a project start and end date, or a need for external review or input and budget checks.
Milestones can add significant value to project scheduling. When combined with a scheduling methodology such as Program Evaluation and Review Technique (PERT) or the Critical Path Method (CPM), milestones allow project managers to much more accurately determine whether or not the project is on schedule. By constraining the dates associated with milestones, the critical path can be determined for major schedule intervals in addition to the entire project. Slack/float can also be calculated on each schedule interval. This segmentation of the project schedule into intervals allows earlier indication of schedule problems and a better view into the activities whose completion is critical.
Milestones are like dashboard reviews of a project. Number of activities which were planned at the beginning of the project with their individual timelines are reviewed for their status. It also gives an opportunity to check the health of the project.
Milestones are frequently used to monitor the progress, but there are limitations to their effectiveness. They usually show progress only on the critical path, and ignore non-critical activities. It is common for resources to be moved from non-critical activities to critical activities to ensure that milestones are met. This gives the impression that the project is on schedule when actually some activities are being ignored.
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