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

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

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Industrial Engineering and Production Management
The important file in making a PERT is

All of the these
An event can't be accomplished until activities leading to it are completed
Length of arrow has nothing to do with time
No activity from any event can be started from preceding event till it is completed

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