Jamie and John are divorced, and they share custody of their twelve-year-old son Connor. Therefore, Connor spends half of the week at his dad’s house and half of the week at his mom’s house. Connor really enjoys playing video games so when he doesn’t get his homework done while at his dad’s house his video games are taken away. However, when he goes to his mom’s house the next day, he can still play them. In applying the principals of behavior modification effectively, his dad is making the mistake of