Industrial Engineering and Production Management
The disadvantage of product layout is

High initial investment for the specialized facilities
High cost of inspection
Production time is longer, requiring more goods in inventory
Skilled labour to operate machines

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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
Activity times are clear
Interrelationship among activities is clearly shown

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