This formula is known as the PERT (Program Evaluation Review Technique) estimate, which is used in project management to calculate a more accurate task duration estimate by considering uncertainty and risk. The PERT estimate formula is a weighted average that takes into account the optimistic (O), most likely (M), and pessimistic (P) estimates of task duration, giving the most weight to the most likely estimate. The formula is expressed as:
PERT Estimate=6O+(4×M)+P
This approach provides a more realistic estimate than just taking an average of past tasks or relying on a single type of estimate because it incorporates a range of possible scenarios.
References: = The information is aligned with the standards and practices described in the Project Management Institute’s (PMI) resources, specifically the PMBOK® Guide and PMP® exam reference materials12.
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