Immature thinking mode (LFSTM) is a middle school mathematics problem-solving thinking mode proposed by Professor Hu Dianshun and Dr Ouyang Liang from the School of Mathematics and Statistics of Central China Normal University and Associate Professor Zhang Yuhuan from the School of Mathematics and Statistics of Henan University.

The origin of unfamiliar thinking mode: in the process of solving problems in middle school mathematics, some students' problem-solving methods are arbitrary or weakly directional. Students make choices through repeated "trial and error" and finally determine the method of solving problems. In this case, solving the problem is inefficient and complicated. Based on this situation, we put forward the thinking mode of "less maturity and the same thinking mode" in solving mathematics problems in middle schools, which is abbreviated as.

See: Teaching Monthly (Teaching Reference) No.2019.04, and the full text reprinted by the National People's Congress No.2019.7 (Mathematics Teaching and Learning in Senior High School).