Industrial Engineering and Production Management
Pessimistic time is

The most probable time considering all conditions
The average time required for a job
The minimum time in which an activity can possibly be accomplished
The maximum time which an activity might require

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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
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

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