The purpose of this study was to evaluate the effects of PDT on the impulsive choice-making of young children with EBD who have difficulty waiting quietly and safely in the absence of other activities or stimuli. Specifically, we aimed to answer the question, does PDT with a school rule-following requirement increase delays at which young children with EBD make self-controlled choices? [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://www.proquest.com.bibliotheek.ehb.be/en-US/products/dissertations/individuals.shtml.]