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

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

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Industrial Engineering and Production Management
Activity slack or float of any event on a PERT/CPM chart is represented by

Latest start time of the event earliest start time of the event
Anyone of the above
Latest finish time of event earliest finish time of the event
Latest start time of succeeding event earliest finish time of preceding event activity time

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