Industrial Engineering and Production Management
Slack represents the difference between the

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

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Industrial Engineering and Production Management
Work study is mainly aimed at

Developing the standard method and standard time of a job
Economizing the motions involved on the part of the worker while performing a job
Establishing the minimum time of completion of a job
Determining the most efficient method of performing a job

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