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

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

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Industrial Engineering and Production Management
A big advantage of PERT over Gantt charts is that in the former case

Activity times are clear
Early start and late finish of an activity are clearly marked
Activities and events are clearly shown
Interrelationship among activities is clearly shown

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