What approach does PERT utilize to determine the critical path of a project?

PERT, which stands for Program Evaluation and Review Technique, employs a specific methodology to address the uncertainty in project scheduling. The correct answer reflects that PERT uses three estimates of timelines for each task: the optimistic time estimate (the shortest possible time to complete the task), the pessimistic time estimate (the longest time it could take), and the most likely time estimate (the best guess of the time required).

This triple estimation allows for a more nuanced approach to project scheduling by taking into account variability and uncertainty inherent in project tasks. By inputting these three estimates into a weighted average formula, PERT can calculate an expected time for each activity, which helps in identifying the critical path—the longest path through the project that determines the shortest possible project duration.

The use of three estimates is instrumental in robustly assessing project timelines, as it provides a balanced view that accommodates both best-case and worst-case scenarios, thereby enhancing the project's planning and risk management processes.