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
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
Activity slack or float of any event on a PERT/CPM chart is represented by

Latest start time of succeeding event earliest finish time of preceding event activity time
Anyone of the above
Latest finish time of event earliest finish time of the event
Latest start time of the event earliest start time of the event

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