The main characteristics of the industrialization era are scale and fine division of labor. At this time, education changed from private school teaching to class teaching system, and teachers began to teach only one professional course. As a team, teachers work together in different workshops of the assembly line for the growth of students. In order to improve efficiency and facilitate work, teachers want to standardize their work objects, just like the parts on the assembly line in the factory. Teachers also hope that their students are standardized and labeled as "qualified products".