Industrial Engineering and Production Management
A big advantage of PERT over Gantt charts is that in the former case

Activities and events are clearly shown
Early start and late finish of an activity are clearly marked
Activity times are clear
Interrelationship among activities is clearly shown

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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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