Once a suitable network has been drawn, with durations assigned to all activities, it is necessary to determine where the longest path is in the network and to see whether it will meet the target completion date. Since the longest path through the project determines minimum project duration, any activity on that path that takes longer than planned will cause the end date to slip accordingly, so that path is called the critical path.
Normally, you would let a computer do these computations for you, so you may wonder why it is necessary to know how to do them manually. My belief is that ...
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