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

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Industrial Engineering and Production Management
The essential condition for the decompression of an activity is that

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