Industrial Engineering and Production Management
Slack represents the difference between the

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

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Industrial Engineering and Production Management
Travel charts provide

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

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