Industrial Engineering and Production Management
In order that linear programming techniques provide valid results

Relations between factors must be linear (positive)
Only one factor should change at a time, others remaining constant
Either (A) or (B)
Relations between factors must be linear (negative)

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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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