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

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

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Industrial Engineering and Production Management
The basic difference between PERT and CPM is that

Guessed times are used in PERT and evaluated times in CPM
Critical path is determined in PERT only
Costs are considered on CPM only and not in PERT
PERT deals with events and CPM with activities

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