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

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

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

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

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Industrial Engineering and Production Management
When slack of an activity is negative

All of these
The activity is critical and any delay in its performance will delay the completion of whole project
It represents that a programme falls behind schedule and additional resources are required to complete the project in time
It represents a situation where extra resources are available and the completion of project is not delayed

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