Industrial Engineering and Production Management
In a PERT chart

Only selected activities are numbered
All activities should be numbered
Only critical activities are numbered
Only important activities should be numbered

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

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

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