Industrial Engineering and Production Management
The important file in making a PERT is

No activity from any event can be started from preceding event till it is completed
Length of arrow has nothing to do with time
An event can't be accomplished until activities leading to it are completed
All of the these

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

All of these
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
It represents that a programme falls behind schedule and additional resources are required to complete the project in time

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