PERT time estimation: sources for probabilistic activity time In PERT, the expected activity time is computed from three time estimates. Identify the inputs used to determine the probabilistic completion time for an activity.

Difficulty: Medium

Correct Answer: All of these (optimistic, most likely, pessimistic)

Explanation:

Given data
PERT uses three estimates: optimistic (t_o), most likely (t_m), and pessimistic (t_p).

Approach
Expected time (t_e) is computed as a weighted average:t_e = (t_o + 4 t_m + t_p) / 6

Conclusion
Therefore, all three inputs are required.

Final Answer
All of these (optimistic, most likely, pessimistic).

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