Parent-implemented AAC verb symbol intervention with children with ASD.

A multiple-probe across participants design was used to examine whether three young children diagnosed with autism spectrum disorder (ASD) could learn to use verb symbols presented on an AAC application to request actions. Using researcher coaching (involving joint planning, descriptive instructions, and guided practice) parents of participants were taught to (a) embed opportunities for children to request actions in daily home routines, (b) model AAC responses, (c) use a prompt hierarchy with a time delay, and (d) contingently reinforce correct aided AAC responses. Following intervention delivered by parents, all three participants increased their use of verb symbols to request actions and parents implemented procedures with high fidelity. There were, however, individualized differences in rate of acquisition, variability of responding, readiness for fading supports, and moving to more advanced skills. One of the three participants was able to master two-step responses involving navigation to a category folder. Generalization of requesting actions to labeling actions was limited.