Exercise CH-17-AON - Chapter 7 Project Management PERT Page 69 CPM with three time estimates The three estimates of an activity time are a to =

Exercise CH-17-AON - Chapter 7 Project Management PERT Page...

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Chapter 7 Project Management PERT
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Page 69 CPM with three time estimates The three estimates of an activity time are : a ( t o ) = Optimistic time; the minimum reasonable period of time in which an activity can be completed. m (t m ) = Most likely time; the best guess of the time required. b (t p ) = Pessimistic time; the maximum reasonable period of time in which an activity Calculation of Expected Time (ET) 6 4 b m a ET + + = 2 6 - = a b Variance
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Problem The home office billing department of a chain of department stores prepares monthly inventory reports for use by the stores purchasing agents. Given the following information, use PERT method to determine: a. How long the total process time will take ? b. Which jobs can be delayed without delaying the early start of any subsequent activity? (slack )
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Jo b A B C D E F G H Immediate Predecessor s - A A B, C B, C E D, F G a m b Time (hours) 0 0 0 9 10 11 18 20 22 25 30 35 15 20 25 10 45 50 10 20 30 0 0 0 Expected T ime (ET) 0 10 20 30 20 40 20 0 6 4 b m a ET + + = A,0 B,10 C,20 D,30 E,20 F,40 G,20 H,0 Net Work Diagram No. 9/83
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