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

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

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Industrial Engineering and Production Management
Critical Path Net Work helps an engineer

To concentrate his attention on critical activities
To divert the resources from noncritical advanced activities to critical activities
To be cautious for avoiding any delay in the critical activities to avoid delay of the whole project
All of these

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Industrial Engineering and Production Management
Pessimistic time is

The average time required for a job
The most probable time considering all conditions
The minimum time in which an activity can possibly be accomplished
The maximum time which an activity might require

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