Earliest Start Time (EST)
In Critical Path Analysis, the earliest possible time at which an activity can begin, based on when all preceding activi...
Formula
EST = Maximum EST of all preceding nodes + their durations
Real World
When Boeing assembles a 787 Dreamliner, the EST for wing-attachment cannot begin until both fuselage sections and wing components have arrived — whichever takes longest sets the EST.
Exam Focus
In a forward pass with two paths meeting a node, always take the highest value — a common error is taking the lowest.
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