Positive reinforcement, the most important and most widely applied principle of behavior analysis (Cooper, Heron, & Heward, 2007) p. 257. Positive reinforcement involves the reinforcing of a stimulus, following a behavior that makes it more likely that the behavior will occur again in the future. This will get Bobby to increase the behavior of cleaning his room more frequently. This will be a desirable outcome, causing Bobby to receive a reward for his actions. Positive reinforcement can strengthen positive behavior. Although, encouragement is wanted to change Bobby’s behavior, it is important to select the appropriate and effective reinforcement. Choosing the right type of reinforcement is important to increase behaviors, but it depends on the child and the situation. A reinforcement that may work on one child may reinforce a bad behavior for another child. We would not use a reinforcement on an 8-year old that could be used on a 2-year old. For example, using sparkling star for a 2-year old as a reinforcer may not work for Bobby, an 8-year old. Sparking stars may not have the same effect; however using maybe a Hot Wheels car may interest Bobby more to change his behavior. Two reinforcements that I may possibly schedule for Bobby are Negative reinforcement and punishment. Negative reinforcement will allow for Bobby to think about the decision to clean his room before his father removes or take it away something he likes. This is where an action can prevent Bobby from deciding not to clean his room. For example, Bobby is supposed to clean his room daily. He continues to refuse to clean his room and decided to go outside to play with his friend without cleaning his room. Mr. Kelly then decides to make Bobby spend the rest of the week doing other chores like cleaning out the garage, taking the garbage out and picking up trash from the lawn along with cleaning his room.