This is one of a series of videos showing an intervention process using an Applied Behavioural Analysis approach. I guess you don't really understand ABA until you see it in action and then it becomes crystal clear. While politically incorrect I am reminded of dog training which uses some of the same sort of processes. Note the reward in this case is the opportunity to play with the "claw" which is a toy version of the classic shopping centre game where the operator moves a crane to grab toys or confectionary.