Industrial Engineering and Production Management
Slack represents the difference between the

Normal allowable time and the latest expected time
Latest allowable time and the earliest expected time
Proposed allowable time and the earliest expected time
Latest allowable time and the normal expected time

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Industrial Engineering and Production Management
The important file in making a PERT is

Length of arrow has nothing to do with time
No activity from any event can be started from preceding event till it is completed
An event can't be accomplished until activities leading to it are completed
All of the these

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