1. Training time: "BJD Big Four" refers to the undergraduate education modes of Peking University and Tsinghua. "BJD" is the abbreviation of "Peking University-Tsinghua University Joint Training Model". Senior four in BJD refers to students who transfer to Tsinghua University to continue their studies after completing their studies in Peking University, which takes a total of eight years. The traditional undergraduate education is four years.
2. Curriculum: BJD focuses on the cultivation of students' comprehensive quality and interdisciplinary learning. Students will have a wider choice of courses and can take courses in different fields across disciplines to broaden their knowledge. Students in traditional undergraduate education can only choose one subject to study. BJD is a special undergraduate education model, which aims to provide more abundant academic resources and development opportunities for outstanding undergraduates.