Abstrak. Anak down syndrome mengalami keterlambatan perkembangan motorik halus yang berdampak pada kesulitan melakukan aktivitas sehari-hari, seperti memasang kancing baju. Penelitian ini bertujuan untuk mengetahui efektivitas penggunaan media busy book dalam meningkatkan kemampuan motorik halus anak down syndrome. Penelitian menggunakan pendekatan kuantitatif dengan metode Single Subject Research (SSR) desain A-B-A. Subjek penelitian adalah seorang anak down syndrome kelas II di SLB-C Negeri Pembina Provinsi Kalimantan Selatan. Data diperoleh melalui observasi dan tes unjuk kerja, kemudian dianalisis menggunakan analisis visual dalam kondisi dan antar kondisi. Hasil penelitian menunjukkan adanya peningkatan kemampuan motorik halus setelah diberikan intervensi menggunakan media busy book. Nilai mean level meningkat dari 20% pada fase Baseline 1 (A1), menjadi 56,66% pada fase Intervensi (B), dan 76% pada fase Baseline 2 (A2). Hasil tersebut menunjukkan bahwa media busy book efektif dalam meningkatkan kemampuan motorik halus anak down syndrome, khususnya pada keterampilan memasang kancing baju.

Kata kunci: busy book, motorik halus, down syndrome, Single Subject Research, memasang kancing baju.

Abstract. Children with down syndrome experience delays in fine motor development, which leads to difficulties in performing daily activities such as buttoning clothes. This study aimed to determine the effectiveness of using "busy books" to improve the fine motor skills of children with down syndrome. A quantitative approach was employed using the Single Subject Research (SSR) method with an A-B-A design. The subject was a second-grade student with down syndrome at SLB-C Negeri Pembina, South Kalimantan Province. Data were collected through observation and performance tests, then analyzed using visual analysis within and across conditions. The results showed an improvement in fine motor skills following the intervention using busy books. The mean level increased from 20% in the Baseline 1 phase (A1) to 56.66% in the Intervention phase (B) and 76% in the Baseline 2 phase (A2). These findings indicate that busy books are effective in enhancing the fine motor skills of children with down syndrome, specifically regarding the skill of buttoning clothes.

Keywords: busy book, fine motor skills, down syndrome, Single Subject Research, buttoning clothes.