The second stage: the initial formation stage of the discipline, the main feature is that pedagogy has become an independent discipline in the primitive state.
The third stage: the stage of discipline development. Pedagogy is developing in a scientific direction, whether in whole or in part.
The fourth stage: the stage of discipline modernization. With the progress of society, the modernization of production, and the modernization of science and technology, pedagogy is urged to develop in the direction of modernization.