Which product development approach revolutionized military equipment production during World War II, dramatically increasing output of vehicles and weapons?

Throughout history, military product development has often led to revolutionary technologies that later transformed civilian life. From radar to the internet, military R&D has changed our world. This poll tests your knowledge about how military product innovation processes have evolved through the centuries and their impact on modern warfare capabilities.

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Assembly line mass production with interchangeable parts
Artisanal craftsmanship with master gunsmiths and armorers
3D printing and rapid prototyping techniques
Just-in-time manufacturing pioneered by Japanese factories