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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Industrial Engineering and Production Management
Routing

Regulates the progress of job through various processes
Determines the programme for the operations
Prescribes the sequence of operations to be followed
Is concerned with starting of processes

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

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

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