In this Yale lecture from Everyday Parenting: The ABCs of Child Rearing, Dr. Alan Kazdin examines punishment, a technique commonly used by parents and teachers to change children's behavior, and reviews research showing it often produces limited lasting change along with meaningful negative side effects. Kazdin explains the psychological reasons punishment tends to suppress behavior only temporarily rather than teaching a new, desired behavior, and contrasts it with the reinforcement-based techniques covered earlier in the course. The lecture encourages parents to reconsider reliance on punishment as a primary strategy and sets up the course's following lessons on how to use punishment, if at all, more carefully and effectively. It is grounded in decades of behavioral research on child discipline.