A milestone is a goal you set for each project so by a certain date the task list associated with it will be completed.

To create a milestone, go to the desired project → Milestones → Add milestone and set a name, due date, the person responsible for it, followed by the associated task lists and a reminder if you wish to.

This way, the assigned user will be notified about the upcoming milestone and make sure the associated task lists will be completed. If the task lists are greyed out, it means they're already associated with an existing milestone.

NOTE: Milestones are not available under the Free plan.

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