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  • Writer's pictureSujoy Dutta, PMP

What is the difference between flag and milestone in Primavera ?

In Primavera P6, a project management software, "flags" and "milestones" are two different types of activities or elements used to manage and track project progress. Here's an explanation of the key differences between them:

  1. Milestones:

    • Purpose: Milestones represent significant points or events in a project's schedule. They are used to indicate key accomplishments, the completion of important tasks, or specific deadlines.

    • Duration: Milestones have zero duration. They represent a single point in time, often marked by a specific date.

    • Symbol: In Primavera P6, milestones are typically represented by a diamond-shaped symbol on the Gantt chart or project schedule.

    • Dependency: Milestones can be used to create dependencies between different activities. For example, an activity might be dependent on the successful completion of a milestone.

    • Example: "Project kick-off," "Client approval," or "Equipment delivery" could be examples of milestones.


  1. Flags:

    • Purpose: Flags are used in Primavera P6 to categorize or label activities. They are often used for sorting and filtering tasks based on specific criteria.

    • Duration: Flags can have a duration, which means they can represent tasks that take time to complete, unlike milestones.

    • Symbol: Flags are not represented by a specific symbol in the Gantt chart. They are typically shown as regular tasks but are labeled with the flag name or code.

    • Dependency: Flags are generally not used to create task dependencies. They are more for organizational purposes.

    • Example: Flags can be used to categorize tasks based on criteria such as "Critical Path," "High Priority," "To Be Reviewed," or any other relevant labels.


In summary, milestones are used to mark significant project events or accomplishments with zero duration, while flags are used for labeling and categorizing tasks, and they can have a duration. Depending on your project needs, you may use both milestones and flags to effectively manage and monitor your project schedule in Primavera P6.

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