A dual language learner (DLL) is a young child who is exposed to and is acquiring two or more languages. Multilingualism is common worldwide, and even in countries like the United States, the number of young children who are DLLs is rising rapidly (Goldstein, 2011; Toppelberg, Snow, & Tager-Flusberg, 1999). The purpose of this article is to:…

Many individuals with autism cannot speak or cannot speak intelligibly. A variety of aided augmentative and alternative communication (AAC) approaches have been investigated. Most of the research on these approaches has been single-case research, with small numbers of participants. The purpose of this investigation was to meta-analyze the single…