The Assessment of Basic Learning Abilities (ABLA) test assesses the ease or difficulty with which persons with developmental disabilities are able to learn 2-choice visual and auditory discriminations. We examined the ABLA's ability to predict 3-choice discrimination performance with 12 adults with developmental disabilities. Participants performed significantly better on 3-choice tasks that require discriminations that they passed on the 2-choice tasks than on 3-choice tasks that require discriminations that they failed on the 2-choice tasks, strengthening the ABLA's predictive validity. Theoretical and applied implications of these results are discussed.