A milestone is used to represent groups of activities or significant events or commitments in the project.

A milestone chart shows a group of milestones in an organized way similar to a Gantt chart with one milestone per line vertically with a description on the left and the milestone located horizontally along a time scale showing when it occurs.

Milestones differ from the bars in a Gantt chart in that they show only a single date and are usually depicted as a triangle instead of a bar.

Milestones can be shown in various colours depicting the status of the milestone.

Milestones can also appear on Gautt chats, project management software supports the placement of milestone on Ghant charts and other project reports and displays generated by the software.