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

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

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

All of these
It represents a situation where extra resources are available and the completion of project is not delayed
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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