Industrial Engineering and Production Management
Slack represents the difference between the

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

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Industrial Engineering and Production Management
When slack of an activity is negative

It represents a situation where extra resources are available and the completion of project is not delayed
All of these
It represents that a programme falls behind schedule and additional resources are required to complete the project in time
The activity is critical and any delay in its performance will delay the completion of whole project

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