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

Critical path is determined in PERT only
PERT deals with events and CPM with activities
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
The important file in making a PERT is

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

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