Answer: with this practice, Ford introduced Work Specialization/ Division of labor.
Explanation: Work Specialization or division of labor is the separation of a task(s) to different workers. In this method of work, efficiency is high.
Initially, the whole car was made by a single person but with Ford's method, one car can be made by more than one person. This is important as the workers will play to their strengths and become experts because of repetition.