Industrial Engineering and Production Management
A big advantage of PERT over Gantt charts is that in the former case

Activities and events are clearly shown
Early start and late finish of an activity are clearly marked
Interrelationship among activities is clearly shown
Activity times are clear

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Industrial Engineering and Production Management
Travel charts provide

An idea of the flow of materials at various stages
A compact estimate of the handling which must be done between various work sections
The information for changes required in rearranging material handling equipment
An approximate estimate of the handling which must be done at a particular station

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

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

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