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

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

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Industrial Engineering and Production Management
PERT

Permits management to foresee quickly the impact of variations from the plan
All of the listed here
Provides a way for management to require that planning be done on a uniform and logical basis
Provides an approach for keeping planning up-to-date

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