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 essential condition for the decompression of an activity is that

An activity could be decompressed to the maximum extent of its normal time
The project time should change due to decompression
An activity could be decompressed to the maximum extent of its normal time
After decompression the time of an activity invariably exceeds its normal time

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