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

After decompression the time of an activity invariably exceeds its normal time
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
The project time should change due to decompression

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Industrial Engineering and Production Management
A big advantage of PERT over Gantt charts is that in the former case

Activity times are clear
Early start and late finish of an activity are clearly marked
Activities and events are clearly shown
Interrelationship among activities is clearly shown

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