Taking education as a reference, the previous informal and informal education can be classified as pre-institutionalized education, and the subsequent informal and informal education can be classified as non-institutionalized education. ① Pre-institutionalized education
② Institutionalized education: The emergence of modern school system has opened a new stage of institutionalized education. From17th century to the end of19th century, strictly speaking, the second half of19th century has basically taken shape. The formation of school education system means the formation of educational institutionalization.