Abstract
Individuals with disabilities who are English learners (ELs) and communicate using speech generating devices (SGDs) may demonstrate a preference for instructional language and language output of their SGDs. The influence of interventionist language on the preference of SGD language output and frequency of mands was examined using an alternating-treatments design with an embedded concurrent-chain arrangement with a 10-year-old with Down syndrome whose heritage language was Spanish. Language preference assessment for ELs is recommended because heritage language may be preferred for children with disabilities who use SGDs.