Disadvantages of a Large Classroom: Disengagement
It is more difficult for teachers to work with students in classes larger than 25 or 30 students. Large classrooms make discussion and group work more difficult. A study conducted by three professors at the University of London found that in larger classrooms, students were less engaged. What was most surprising to the professors was that students who disengaged were the students struggling most in school. Also, the teacher had more negative behaviors to address with students who were having difficulty in school.