The document discusses different types of reinforcement used to encourage positive behaviors. It defines reinforcement as anything that strengthens or increases a desired behavior. There are four main types of reinforcement: positive reinforcement which involves rewarding good behavior; negative reinforcement which removes an undesirable stimulus; punishment which adds an undesirable stimulus to reduce a behavior; and extinction which involves removing a reinforcer to reduce a behavior. The document also discusses various strategies for reinforcement including using praise, activities, tokens, or tangible rewards on fixed or variable schedules to shape student behavior in the classroom.