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

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

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

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