Question

latest time by which an activity must be completed

Answer 1

Hey!
The last time by which an activity must be completed is deadline.

Answer 2

Definition: Thelatest start timefor an activity is the latestpossible time that it can start without delaying the completiondate of the project.

LS(A) = latest start time for activity ALF(A) = latest finish time for ALS(A) = LF(A) – (estimated) duration of activity A

Latest Finish Time Rule:The latest finish time of activity Xequals the smallest of the latest start times of itsimmediatesuccessors.

This means: An activity must finish in time to enable all itsimmediate successors to begin by their latest start times

.Example: The only immediate successor to node M is FINISH.FINISH must be reached in 44 weeks.LF(Finish) = EF(Finish) = 44LS(Finish) = 44 – 0 = 44The Latest

I hope it will help you