What is Milestone?
A significant checkpoint or event in a project that marks the completion of a major phase, deliverable, or decision point.
Detailed Explanation
Milestones are zero-duration events that represent important achievements or transition points in a project. They typically mark the completion of a major deliverable, the end of a project phase, a critical decision point, or an external dependency (such as a regulatory approval). Milestones serve as progress markers that help stakeholders understand where the project stands without needing to know every task detail. They are often tied to payment schedules, governance reviews, or go/no-go decisions. A well-chosen set of milestones provides a high-level project narrative that is meaningful to all stakeholders, from the project team to executive sponsors and clients.
Why It Matters
Milestones provide the anchor points that keep projects on track and stakeholders aligned. They create natural review points for assessing progress, quality, and direction. Without milestones, projects can drift gradually off course without anyone noticing until it is too late to correct.
Example
A website redesign project defines five milestones: Discovery Complete (week 2), Design Approved (week 4), Development Complete (week 8), User Acceptance Testing Passed (week 10), and Go-Live (week 11). The client receives a progress report at each milestone, and the next phase does not begin until the milestone is formally signed off.
Related Terms
A tangible or intangible output produced as a result of project work that must be provided to a stakeholder.
The longest sequence of dependent tasks in a project that determines the minimum project duration.
A fixed-length iteration (typically 1-4 weeks) during which a development team works to complete a defined set of tasks or user stories.
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