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
Activities and events are clearly shown
Interrelationship among activities is clearly shown
Activity times are clear

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Industrial Engineering and Production Management
Pick up the incorrect statement about advantages of work sampling

Calculations are easier, method is economical and less time consuming
No time measuring devices are generally needed
Permits a fine breakdown of activities and delays
Simultaneous study of many operators may be made by a single observer

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