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 (negative)
Relations between factors must be linear (positive)
Either (A) or (B)

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Industrial Engineering and Production Management
Travel charts provide

An approximate estimate of the handling which must be done at a particular station
A compact estimate of the handling which must be done between various work sections
An idea of the flow of materials at various stages
The information for changes required in rearranging material handling equipment

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