I explain all the rules to follow and unacceptable behavior. Then I have a traffic light large enough to hold all the student's names on clothespins (close to the green area and use both sides). I also have another board which has three phrases: STRIKE ONE, STRIKE TWO, STRIKE THREE. Everyone begins the day on green light, I give students 3 chances before moving off the green light, after exhausting the 3 STRIKES they move to yellow light area and then red. RED is the most extreme! If their behavior improves they move back to green.