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

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

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Industrial Engineering and Production Management
The basic difference between PERT and CPM is that

Guessed times are used in PERT and evaluated times in CPM
Critical path is determined in PERT only
PERT deals with events and CPM with activities
Costs are considered on CPM only and not in PERT

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