We don't think it is necessary. Attendance can play a certain role in urging students to attend classes, but in college, I think what is more important is our own consciousness. Some students actually don't want to come to class. Even if they pass the attendance system, they may not be able to concentrate in class. If you talk to other students, it will not only affect the classroom discipline, but also affect the teacher's mood in class. This is for those students who are not very conscious and have poor grades. For students with good grades, even if there is no attendance system, they will arrive at school on time and listen attentively. There is no need for the constraint of attendance system. College students are all adults and should be responsible for their actions. Even if you fail because you don't attend classes, you deserve it. You can't blame others.