It is an analysis techniques can be used when the individual task times estimates are fairly uncertain. Instead of putting a point estimate for the duration estimate PERT uses three times estimates.
Formula example: (optimistic time+4X most likely time+ Pessimistic time)/6
(8 workdays+4*10work days+24 work days)/6 =12 Days
Where Optimistic time= 8 Days
Most likely time = 10 days
Pessimistic time = 24 days
So most likely time will be 12 days
Estimating duration this way allows managers to calculate a more realistic project schedule.
PERT charts are an excellent training tool for a project controls person to truly understand the underpinnings of a schedule,” says PMFocus’s Patterson.
PERT charts help project teams visualize the order of tasks, milestones and phases within a project. Illustrating the project schedule makes it easy to identify tasks as one of two types:
- Dependent, or sequential tasks
- Non-dependent, or concurrent tasks
This allows managers to coordinate work across teams and departments more effectively.