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

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Industrial Engineering and Production Management
PERT

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

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