Due to the epidemic situation in Hong Kong, City University of Hong Kong announced that the second semester of 2002122 will adopt flexible teaching arrangements, which will take effect from 2022104. All classes with 40 students or less can teach face to face on campus, and special arrangements will be taken when necessary. Classes with more than 40 students will be taught in a mixed mode (that is, face-to-face and online teaching will be conducted on campus, or whether it is purely online teaching will be decided by the course leader).