The word "learning case" originated from the unique genre of "learning case" in China in history, and is often used to study and summarize the 2500-year history of Confucianism in China. For example, Huang Zongxi, a great scholar at the end of Ming Dynasty and the beginning of Qing Dynasty, compiled a case study of Song and Yuan Dynasties and a case study of Confucianism in Ming Dynasty, which are examples of following the traditional style of "case study".
The specific time when this school appeared is unknown, and the classic can be found in the Song and Yuan Learning Cases compiled by Huang Zongxi at the end of Ming Dynasty.