Module I_Project Mgmt II

Module I_Project Mgmt II - Critical Path Analysis After the...

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IELM120 Critical Path Analysis 1 After the network diagram has been set up, we are ready to perform the critical path analysis Note: the way of recording information here is slightly different from the textbook
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IELM120 Forward & Backward Pass Notation for Critical Path Method 2 t = single estimate of mean activity duration T E = earliest event occurrence time T L = latest allowable event occurrence time ES = earliest activity start time EF = earliest activity finish time LS = latest allowable activity start time LF = latest allowable activity finish time S = total activity slack
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IELM120 Perform a Critical Path Analysis Forward Pass (Begin at starting event and work forward) Earliest Start Time Rule: ES = ______(EF of all immediate predecessors) EF = ES + Activity time Backward Pass (Begin with the last event and work backwards) Latest Finish Time Rule: LF = ______ (LS of all immediate following activities) LS = LF – Activity time 3
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IELM120 CPM Network B,20 D, 18 F, 9 I, 4
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IELM120 Forward Pass Calculations 5
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IELM120 Forward and Backward Pass Calculations 6
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IELM120 Activity Slack and Critical Path By comparing the forward & backward pass we can deduce the activity slack Activity slack (S) is the amount of delay of an activity without affecting the project finish time S = LF –EF Critical path is the path that has no slack; that is it takes the longest time to finish Critical path is important, because delay in the activities on the critical path would directly impact on overall project schedule
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