how do you determine the ES, LS, EF, and LF for each activity?
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Mark “start” node: ES=EF=0.
Repeatedly do this until finishing all nodes:
For a node whose immediate predecessors
are all marked, mark it as below:
•ES = Latest EF of its immediate
•EF = ES + t
•Note: EF=ES at the Finish node.
Mark “Finish” node:
LF = LS = EF of “Finish” node.
For a node whose immediate children’s are
all marked with LF and LS, mark it as below:
Earliest LS of its immediate children,
LS=LF at Start node.
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