It makes it easy to see which teams are waiting on others.
Arrows represent the actual work or "activities" being performed. They connect the nodes and indicate the direction of the workflow. The length of the arrow does not typically represent the duration of the task, but the arrow is usually labeled with the task name and its estimated time. Detailed Data within the PERT Format pert chart format
Use the O, M, and P values to calculate the expected duration for each activity. It makes it easy to see which teams are waiting on others