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:
    • Optimistic
    • Most-likely
    • Pessimistic
  • 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.

Helpful Links relating to PERT Charts

The Ultimate Guide…PERT Chart

PERT Videos


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