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
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
The project time should change due to decompression

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Industrial Engineering and Production Management
In queuing theory, the nature of the waiting situation can be studied and analysed mathematically if

All variables and constants are known and form a linear equation
The laws governing arrivals, service times, and the order in which the arriving units are taken into source are known
Complete details of items in, waiting line are known
Arrival and waiting times are known and can be grouped to form a waiting line model

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