Industrial Engineering and Production Management
The important file in making a PERT is

All of the these
Length of arrow has nothing to do with time
No activity from any event can be started from preceding event till it is completed
An event can't be accomplished until activities leading to it are completed

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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
The project time should change due to decompression
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

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