Program Evaluation and Review Technique (PERT)

Photo by  jean-louis Zimmermann

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.

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