In this lecture from Yale's Everyday Parenting: The ABCs of Child Rearing, Dr. Alan Kazdin introduces the technique of developing and praising the positive opposite of a child's unwanted behavior, a research-backed approach to reducing problem behaviors by reinforcing their direct alternative instead. Kazdin explains why parents' natural instinct to focus on and correct negative behavior can be less effective than actively rewarding the desired opposite behavior when it occurs. The lecture walks through how to identify a clear positive opposite for common childhood behavior problems and apply consistent praise to reinforce it. It extends the course's growing set of ABCs techniques, following earlier lessons on antecedents, shaping, simulation, and modeling.