Industrial Engineering and Production Management
Pessimistic time is

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

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

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