Many children who require augmentative and alternative communication (AAC) have difficulties shifting from the single-to multi-symbol stage of language development. Ensuring that children who use AAC receive evidence-based interventions to address this problem is critical. Furthermore, there has been little AAC treatment efficacy research to date that addresses the needs of multicultural populations, particularly those of Latino children who use AAC and their families. To address these issues, the current investigation used a mixed methodology, which included a focus group to determine if any changes needed to be made to an existing instructional program; and a single subject, multiple probe, across participants design to evaluate the effects of a caregiver instructional program on the multi-symbol utterance productions of Latino children who used AAC. Specifically, a cognitive strategy instructional approach that has been used to teach turn-taking skills to both Caucasian and African American children who use AAC was modified and used to teach caregivers how to support the production of their children's multi-symbol messages. In order to foster emergent literacy skills, caregivers implemented the strategy during book reading activities. Focus group results revealed that changes to the instructional program may be required for some Latino families. With regard to the instructional program, all caregivers successfully learned to use the instructional strategy, and all children increased their use of multi-symbol messages. Research and clinical implications of the findings are discussed.

Augmentative and alternative communication (AAC) service provision can be time-consuming, and it is important to ensure that the time invested in aided AAC interventions is worth the costs. As children who use AAC are multimodal communicators, it is important to understand the effects that aided AAC interventions may have not only on AAC use but also on other communication modes, including speech and symbolic gestures. Toward these ends, this article contains a review of commonly used AAC intervention techniques, a discussion of how use of these techniques affects aided AAC use, and an examination of the effect that AAC interventions have on other communication modes, including speech and various types of gestures. Overall, current research findings indicate that aided AAC interventions can be highly effective for teaching students who use AAC to become more effective communicators and that such interventions do not have a negative effect on speech-and may, in some cases, have a positive effect on speech.