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A program evaluation review technique chart, known as a PERT chart, is a graphical illustration or representation of a project’s schedule, which shows the sequence of tasks to be performed. PERT charts aid in determining the critical path of tasks and help in completing the project within a given time frame.
PERT charts were first developed by U.S. Navy in 1950 to support very large and complex projects during the cold war era. To complete a given project with in a specified time, the factors to be evaluated include the shortest time the project can be completed and deciding on the activities to be completed first, allowing the project to be finished in the shortest time. These activities are represented in the PERT chart as a critical path.