Final answer:
The standardized parts and quasi-assembly lines of meatpacking and mail-order industries were combined with the concept of men standing still while materials moved on a moving assembly line. This approach, greatly refined by Henry Ford, led to mass production with increased efficiency.
Step-by-step explanation:
In the development of assembly line production, various industries combined the concept of standardized parts with the innovative idea of a moving assembly line. Henry Ford was instrumental in refining this process by establishing the production model where workers stood still while performing specialized tasks, and materials and partially assembled products moved past them on a conveyor belt.
The moving assembly line facilitated a division of labor where each worker was trained to complete only one or two steps in the manufacturing process. This division of labor was key to the mechanization of factories and contributed to the shift from skilled to unskilled factory work, making it possible to easily replace workers and maintain high production rates.