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
Pick up the incorrect statement about advantages of work sampling

Calculations are easier, method is economical and less time consuming
Simultaneous study of many operators may be made by a single observer
Permits a fine breakdown of activities and delays
No time measuring devices are generally needed

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