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As a special educator, I learned about ABC (antecedent conditions, behavior, consequences). When you describe a teacher anticipating what may happen, you recognize that a teacher who can determine what the triggers are that cause the impulsivity has a “leg up.” I believe that anticipation requires careful observation of a student within the classroom context. Then you can determine how to modify the antecedents. By doing so, you will short circuit the impulsive behavior. I have seen teachers successfully teach students to use a meta-cognitive checklist (sometimes with visuals).