Effects of an iPad-based Speech-Generating Device Infused into Instruction with the Picture Exchange Communication System for Adolescents and Young Adults with Severe Autism Spectrum Disorder.

Intervention was discontinued when participants did not reach the mastery criteria in nine sessions and a positive trend to mastery was no longer observed.

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An increasing trend was observed during the intervention; however, this trend did not continue when Steve entered a new phase.

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The number of requesting in post-treatment generalization showed an immediate increase in level but a decreasing trend was observed.

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