Traditional behaviorism dictates all human behavior is explained by classical conditioning and operant conditioning. Behavior therapy relies on the principles of behaviorism, such as involving classical and operant conditioning. It was his work on learning theory that resulted in operant conditioning within behaviorism. Proponents of behaviorism argued that language may be learned through a form of operant conditioning. BSR can serve as a robust operant reinforcer. "Reinforcement" is a basic term in operant conditioning. Reinforcement is an important part of operant or instrumental conditioning. Latent responses constitute a repertoire, from which operant reinforcement can select. Reinforcement and punishment are the core tools through which operant behavior is modified. She focused on the use of desensitization combined with classical and operant conditioning. It depends on operant variability and reinforcement, as described above. Edward L. Thorndike used the reward system to study operant conditioning. It is used to study both operant conditioning and classical conditioning. Shaping is based on a behavior analyst's thorough knowledge of operant conditioning principles and extinction. These effects occur during both classical and operant conditioning.