L27_Project Scheduling - PERT

L27_Project Scheduling - PERT - PERT Networks PERT In PERT...

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PERT Networks PERT Networks In PERT the duration of any activity is indeterministic. It bases the duration of an activity on three estimates: Optimistic Time, a Most Likely Time, m Pessimistic Time, b
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The range [a, b] is assumed to enclose all possible estimates of the duration of an activity. Based on these estimates, the average time, f8e5 D, and variance , ν , are computed as follows: 6 4 b m a D + + = 2 6 - = a b ν CPM calculations given earlier will be applied directly, with f8e5 D replacing the single estimate D.
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Consider the network with the estimates of the activities given below:
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Activity a m b f8e5 D ν (1,2) 2 5 8 5 1 (1,3) 1 4 7 4 1 (2,3) 0 0 0 (2,4) 2 4 6 (2,6) 5 7 12 (3,4) 3 5 10 (3,5) 3 6 9 (4,5) 4 10 6 (4,6) 2 5 8 (5,6) 2 4 6 0 0 4 0.44 7.5 1.36 5.5 1.36 6 1 6.33 1 5 1 4 0.44
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1 3 2 5 4 6 Dummy 4 6 4 7.5 5 6.33 0 0 5 5 16.83 20.83 20.83 16.83 10.5 5 5 0
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Thus the mean duration of the project = 20.83 days The variance of the duration of the project =
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L27_Project Scheduling - PERT - PERT Networks PERT In PERT...

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