This document provides information on applications of classical conditioning, including graduated exposure, aversion therapy, and flooding. It defines these terms and provides examples of how each could be used to treat phobias or unwanted behaviors. Graduated exposure involves gradually exposing someone to a feared stimulus to extinguish their conditioned response. Aversion therapy pairs an undesired behavior with an unpleasant stimulus to reduce that behavior. Flooding exposes someone to a feared stimulus for an extended period to help them extinguish their fear response.