Necessary and sufficient conditions for critical path in PERT / CPM. (Apr 2006)
Necessary conditions: If Earliest occurrence time equals Latest occurrence time for Tail and Head event of the activity, then it possibly can be a critical activity.
Sufficient condition:Â Â If the necessary condition is satisfied and ES and LS of activity are same, also EF and LF of activity is same; then the activity is definitely a critical activity.
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