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
In queuing theory, the nature of the waiting situation can be studied and analysed mathematically if

The laws governing arrivals, service times, and the order in which the arriving units are taken into source are known
Complete details of items in, waiting line are known
Arrival and waiting times are known and can be grouped to form a waiting line model
All variables and constants are known and form a linear equation

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