The earliest possible dates an activity can start and finish based on when all prior tasks are done.
Early Start (ES) and Early Finish (EF) are forward-pass CPM calculations that determine the earliest possible date an activity can begin and the earliest possible date it can be completed, given its predecessors and durations. ES is calculated as the maximum EF of all predecessors plus any lag. EF equals ES plus duration minus one. These dates define the boundaries within which work can be scheduled without delaying successors.
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