COOP students came out to practice in front of the class, and then see whether student practice, correct? If it does not have to be a teacher to introduce accurate methods to students.
Random student out of the class action. Then see how students performed correctly and if not, teachers will be introduced to the students the correct way.
Random practice students out in front of the class. And see what the students correctly or not. If you do not have to be a teacher will introduce the correct way to แก่นักเรียน.