Classrooms and schools with more disciplinary problems are less conducive to learning, since teachers have to spend more time creating an orderly environment before instruction can begin. More interruptions within the classroom disrupt students' engagement and their ability to follow the lessons. The disciplinary climate is indicated in PISA by how often student do not listen to the teacher during lessons on the language of instruction; there is noise and disorder; the teacher has to wait a long time for students to quiet down; students cannot work well; and students do not start working for a long time after the lesson begins.