ABSTRACT

This study systematically reviewed single-subject research (SSR) involving adults with developmental disabilities in South Korea. Following PRISMA guidelines, 19 studies published between 2007 and 2025 were identified. Study characteristics were coded using the PICO framework, and methodological rigor was assessed using CEC quality indicators for single-subject design (SSD). Participants were predominantly adults with intellectual disabilities in their early twenties. Multiple-probe designs were most frequently employed. Dependent variables targeted functional domains, such as vocational and daily living skills, communication, problem behavior, and cognitive-academic outcomes. Interventions encompassed smart device–assisted instruction, self-management, video-based instruction, visually structured methods, functional instruction, sensory supports, perceptual–motor skills training, and positive behavior support (PBS). Maintenance, generalization, and social validity were inconsistently reported. CEC-based analysis indicated strong reporting of participant characteristics and outcome measurement but limited information on interventionist and procedural fidelity. Internal validity was generally adequate. This study outlines the structural and methodological characteristics of SSR involving adults with developmental disabilities in South Korea, providing foundational data to guide future evidence-based interventions and improve research quality.

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