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

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

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Industrial Engineering and Production Management
Routing

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

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Industrial Engineering and Production Management
Travel charts provide

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

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