A Network Diagram is a more useful project management tool than a Gantt chart because it provides greater detail on A Network Diagram can be used to define the Critical Path: the sequence of project activities that add up to the total duration. This allows us to determine the date by which the project can be completed. If the completion of any task can be delayed without delaying overall project completion it has Such tasks are on the Critical Path. The slack for any given task is calculated as $($ Event Time$)$ Event Time$).$