But not every teacher is not able to have students back. Actually what I am talking is nothing to do with class discipline nor with the student number, it has something to do with the teacher personality. In our school history we had one teacher from the US who even now still is talked and praised by students and parents though he left two years ago. Whoever attends his class will come back, because they understand him. Why? He understands students, understand Chinese, he knows to select words which kids can understand. This is a teacher, this is method. Each of classroom in my school holds up no more than 18 kids, the teacher should no problem to draw kids attention.