The PERT technique utilizes how many distinct time estimates for tasks_________________?
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Answer: C. three time estimate
Explanation
PERT uses three time estimates—optimistic, most likely, and pessimistic—to account for uncertainty in activity durations. Project evaluation and review techniques incorporate three distinct duration estimates to calculate expected task completion times. Applying three time estimates helps project managers quantify risk and uncertainty in complex scheduling environments. Three-time estimating captures the inherent variability and unpredictability of complex engineering and construction projects. The beta probability distribution combines optimistic, pessimistic, and most likely estimates to find expected task durations. Probabilistic scheduling models provide a more realistic completion timeframe than single-point deterministic scheduling methods.
Civil construction planners use PERT networks to manage complex schedules involving unpredictable weather and supply delays. Aerospace development programs rely on three-time estimates to mitigate schedule risks during prototype manufacturing phases. Project managers analyze variance in PERT estimates to identify critical path activities requiring close supervision. A single time estimate is characteristic of deterministic scheduling methods like the Critical Path Method rather than PERT. Two time estimates are insufficient for calculating the statistical mean and variance parameters used in PERT models. Nil time estimates would imply instantaneous task execution, which contradicts real-world project operational constraints.
- Subject
- Engineering
- Category
- Mechanical Engineering
- Topic
- —
- Difficulty
- medium
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