What is a milestone?
Milestones are important steps in a project. They mark a deadline, a stopping point in a process. It can be a delivery date, a step requiring validation…
How is a milestone diplayed on the schedule?
A milestone task is represented with pointed ends in the planning views 
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To learn more, please read our article dedicated to links and milestones by clicking on the following link: https://www.beesbusy.com/resources/features/tasks/links-milestones-manage-dependencies-tasks/