PERT is a network planning tool that is event-oriented.
Rules for Creating a PERT
- All individual tasks must be included in the network.
- Events and activities must be sequenced to allow for determination of the critical path.
- Include (3) time estimates for each activities:
- Calculate the critical path and the slack times for the project.
- Critical path: the sequence of tasks that take the longest.
- Slack = Latest date an event can occur – earliest data an event can occur.
- Thus, events on the Critical Path have a slack of 0.
Advantages of PERT
- Making the diagram can unveil interrelationships, bottlenecks, and problem areas.
- Probabilities of achieving the deadline can be calculated.
- Much easier to meet a deadline because you can see alternative plans.
- Easy to evaluate changes to the plan.
- Large amount of data simply displayed.
Disadvantages of PERT
- May create implementation problems due to complexity.
- More data is needed to create this compared to a Gantt chart.
Compared to other Methods
Because CPM can take cost into considerations it can be more rigorous than PERT.