Minimizing Disruptions

Petition your principal not to allow PA announcements to break into class time except in emergencies or at specified times (five minutes after school begins, five minutes before lunch, during recess, at the end of the day). PA announcements can completely destroy students' train of thought when they're writing poetry or struggling to grasp a new concept. Instead, ask the office to send a messenger who's been trained not to knock on the door but to quietly step inside and choose an appropriate time to seek the teacher's attention so that students aren't distracted any more than absolutely necessary.