Assertive discipline is a classroom management approach that emphasizes establishing clear rules and consequences for behavior, as well as positively reinforcing desirable behavior. It involves 6 steps: 1) building student-teacher relationships, 2) establishing rules, 3) tracking misbehavior, 4) using punishment to enforce limits, 5) implementing rewards for good behavior, and 6) gaining parent support. Teachers are trained to communicate rules firmly but not abusively, and apply appropriate punishments like timeouts or loss of privileges, while also rewarding students with praise, privileges, or awards when they follow rules. The goal is to catch students behaving well and shape behavior through positive reinforcement.