The purpose of this paper is to identify strategies for preventing and managing classroom discipline problems that any teacher, even a student teacher, can use successfully. Sixty-eight student science teachers, during their first weeks of student teaching, each reported, in an account of a well-remembered event about classroom management, successfully using one or a combination of 18 different proactive and reactive discipline strategies adapted from Levin and Nolan (2003). Three strategies, however, were particularly fruitful: changing the pace of the lesson, using the least intrusive intervention along a sequence of nonverbal to verbal strategies, and conferring privately with a chronically disruptive student.