Answer to Question 1
A
Answer to Question 2
PERT (Program Evaluation Review Technique; Concept) is a technique that uses optimistic, pessimistic, and realistic time estimates to calculate the expected time for a particular task. This technique can help you to obtain a better time estimate when there is some uncertainty as to how much time a task will require to be completed. The optimistic (o) and pessimistic (p) times reflect the minimum and maximum possible periods of time for an activity to be completed. The realistic (r) time, or most likely time, reflects the project manager's best guess of the amount of time the activity actually will require for completion. Once each of these estimates is made for an activity, an expected time (ET) can be calculated. Because the expected completion time should be closest to the realistic (r) time, it is typically weighted four times more than the optimistic (o) and pessimistic (p) times. Once you add these values together, it must be divided by six to determine the ET. This equation is shown in the following formula:
ET = (o + 4r + p)/6 where ET = expected time for the completion for an activity; o = optimistic completion time for an activity; r = realistic completion time for an activity; p = pessimistic completion time for an activity.
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