Good classroom management supports good instruction. Just as important, instruction that actively engages students' attention and efforts decreases the incidence of student misbehavior. This "What We Know About" discusses the link between instruction and management, describes daily routines that contribute to a smoothly run classroom, and talks about the how-to's of dealing with problem behavior. Finally, it discusses the key role a schoolwide approach to behavior management can play in helping staff and students establish an environment in which good behavior is the norm.