Industrial Engineering and Production Management
Slack represents the difference between the

Proposed allowable time and the earliest expected time
Latest allowable time and the earliest expected time
Normal allowable time and the latest expected time
Latest allowable time and the normal expected time

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

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