When it was originally developed, PERT used certain (deterministic) methods to estimate activity duration.

Question

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PERT (Program Evaluation and Review Technique) was originally developed to handle uncertainty in project schedules by using probabilistic time estimates rather than deterministic (fixed) methods. It involves estimating the shortest possible time, the most probable time, and the longest time an activity might take, allowing for a range of possible completion times.

When It Was Originally Developed, PERT Used Certain (Deterministic) Methods