Three adolescents with severe mental retardation were trained to request snacks from visible three-item snack sets. During subsequent stimulus control assessment sessions, one subject requested food items when no food items were present, two frequently requested a missing item when the two other items were visible, and all subjects requested…

This study found consistently reduced levels of problem behaviors with three students (ages 5-11) with severe autism and/or mental retardation when the students were given opportunities, during a session, to make choices among instructional tasks and reinforcers. Choice-making opportunities did not impact the rate of correct responding on…