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

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Industrial Engineering and Production Management
Critical Path Net Work helps an engineer

To concentrate his attention on critical activities
To divert the resources from noncritical advanced activities to critical activities
All of these
To be cautious for avoiding any delay in the critical activities to avoid delay of the whole project

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