Using an activity plan as its basis, the PERT Chart is used to
define the critical path of a project.
When to Use It
After an activity plan has been created to show the tasks needed
to complete the activity and their relative timing.
During the implementation of the project to monitor the status.
The project team should keep a constant eye on the critical path.
This is the shortest amount of time that the implementation can be
completed in. If any task on the critical path slips, then the
timing of the entire implementation will slip.