Program Evaluation and Review Technique PERT

In the program evaluation and review technique (PERT), developed by the US Navy in the 1950s as part of the Polaris mobile submarine launched ballistic missile project, network charts depict task, duration, and dependency information. Each chart starts with an initiation node from which the first task, or tasks, originates. If multiple tasks begin at the same time, they are all started from the node or branch, or fork out from the starting point. Each task is represented by a line, which states its name or other identifier, its duration, the number of people assigned to it, and in some cases the initials of the personnel assigned. The other end of the task line is terminated by another node that identifies the start of another task, or the beginning of any slack time, that is, waiting time between tasks. Each task is connected to its successor tasks in this manner forming a network of nodes and connecting lines. The chart is complete when all final tasks come together at the completion node. A PERT chart may have multiple parallel or interconnecting networks of tasks. If the scheduled project has milestones, checkpoints, or review points (all of which are highly recommended in any project schedule), the PERT chart will note that all tasks up to that point terminate at the review node.

In order to construct a PERT chart the following need to be carried out.

1. Identify the specific activities and milestones

2. Determine the proper sequence of the activities

3. Construct a network diagram

4. Estimate the time for each activity

• Optimistic time

• Most likely time

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Project Management Made Easy

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