Industrial Engineering and Production Management
The basic difference between PERT and CPM is that

Costs are considered on CPM only and not in PERT
PERT deals with events and CPM with activities
Guessed times are used in PERT and evaluated times in CPM
Critical path is determined in PERT only

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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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