400
Teaching middle school and high school is different than elementary because students frequently change classrooms and teachers have around 5 batches of 25-25 students in a day. Thus researches have said different things must be done to manage the classroom, such as these 3 things. Hint: pg. 410-411
What are arranging physical space to optimize teaching/learning, clearly stating classroom rules, and establishing and communicating classroom procedures to students"?