Title slide says "Pruning the bush of possible responses". Video of a teacher and a student at a table. Teacher is holding a cookie. On screen text says "Screaming does not get the cookie". Student screams while holding out his hand for the cookie. On screen text says "Crying does not get the cookie". Student is crying while holding out his hand for the cookie. On screen text says "Jumping does not get the cookie". Student is jumping up and down. On screen text says "Nagging does not get the cookie". Student is nagging saying cookie several times while holding out his hand for the cookie. On screen text says "Saying cookie without problem behavior gets the cookie". Student politely asks for the cookie and the teacher says "cookie" and hands the student the cookie.