Abstract
This study examines the effects of the Picture Exchange Communication System (PECS) used by parents through parent training for children with autism spectrum disorder (ASD) who have limited speech on children's independent picture exchange and spontaneous speech, and parenting stress levels. The participants were children with ASD aged three to five years old and four parents each; the study was conducted at their homes. This study used a changing criterion design, and Tau-U analyzed the effect size. As a result of the study, two of the four children (whose overall developmental age of PEP-R was over 16 months) completed the PECS phase four within 40 sessions. The effect size were very productive during the intervention. For spontaneous speech, we confirmed that children with high verbal imitation skills learned to speak easier. We also confirmed that spontaneous speech increased during the PECS phase four, but the effect size had little impact during the intervention. All four children maintained the acquired phase and were able to generalize. The parents implemented the PECS according to protocol, and we confirmed that the parenting stress was partially reduced in the parent domain for parents who used the PECS method with their children.
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