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PMI Scheduling Professional · PMI
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- The backward pass is the second step in CPM calculations, moving backward through the network from the project end date to determine the latest allowable start (LS) and latest allowable finish (LF) for each activity without delaying the project. LF is determined by the earliest LS of all successors, and LS = LF - Duration. The difference between early and late dates (LS - ES or LF - EF) yields total float.