Program Evaluation and Review Technique Article

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PROGRAM EVALUATION AND REVIEW TECHNIQUE (PERT) Category: Planning/ Monitoring - Control ABSTRACT Program (Project) Evaluation and Review Technique (PERT)(G) is a project management tool used to schedule, organize, and coordinate tasks within a project. It is basically a method to analyze the tasks involved in completing a given project, especially the time needed to complete each task, and to identify the minimum time needed to complete the total project. PERT planning involves the following steps:       Identify the specific activities and milestones. Determine the proper sequence of the activities. Construct a network diagram. Estimate the time required for each activity. Determine the critical path. Update the PERT chart…show more content…
Determine the critical path. The critical path is determined by adding the times for the activities in each sequence and determining the longest path in the project. The critical path determines the total calendar time required for the project. If activities outside the critical path speed up oe slow down (within limits), the total project time does not change. The amount of time that a non – critical path activity can be delayed without the project is referred to as a slack time. If the critical path is not immediately obvious, it may be helpful to determine the following four quantities foe each activity: ES – Earliest Start time EF - Earliest Finish time LS – Latest Start time LF - Latest Finish time These times are calculated using the expected time for the relevant activities. The earliest start and finish times of each activity are determined by working forward through the network and determining the earliest time at which an activity can start and finish considering its predecessors activities. The latest start and finish times are the latest times that an activity can start and finish without delaying the project. LS and LF are found by working backward through the network. The difference in the latest and earliest finish of each activity is that activity’s slack. The critical path then is the path through the network in which none of the activities have slack. The variance in the project completion time can be calculated by