Applied Behavior Analysis is the study of human behavior. Over 70 years ago, B.F. Skinner studied behavior and its origins. He believed that human behavior does not originate inside of us, but rather through daily social and environmental interactions. Today we take Skinner's scientific studies of human behavior (behavior analysis) and apply them to our teaching strategies. Applied Behavior Analysis (ABA) simply means that we have taken the pure science of behavior analysis and applied it to situations such as teaching. In 1957, B.F. Skinner published the book Verbal Behavior. Skinner's book coined terms for the many verbal operants or functional units of language that are used to communicate. Skinner explained the function of each verbal operant as it relates to human behavior and the environment. Through the use of Verbal Behavior and Skinner's research in Behavior Analysis, we can effectively teach children with autism and related disorders how to communicate and interact with their environment.