Final answer:
Henry Ford used scientific management principles and time-motion studies to develop his assembly line, streamlining the production process and increasing efficiency.
Step-by-step explanation:
Henry Ford used scientific management to develop his assembly line by implementing Taylorism principles and time-motion studies. Taylorism, also known as the principles of scientific management, aimed to improve productivity by reducing wasteful movements. Ford's assembly line allowed factory workers to complete the same task repeatedly, increasing production efficiency and reducing costs. By dividing the manufacturing tasks into short, repetitive segments, Ford was able to streamline the production process and make workers cogs in a well-oiled machine.