<![CDATA[This study aimed to develop a Smart Letter Box learning media that is valid, practical, and effective for improving the early literacy skills of children aged 5–6 years at TK Syeikh Abdurrauf Banda Aceh. The study employed a Research and Development (R&D) approach using the ADDIE model, comprising Analysis, Design, Development, Implementation, and Evaluation stages. The participants were 15 children in Group B. Data were collected through expert validation sheets, teacher response questionnaires, observations, and early literacy assessments. Data were analyzed using descriptive qualitative and quantitative techniques based on percentage scores. The results showed that the Smart Letter Box achieved an average expert validation score of 87.5%, categorized as highly feasible, while teacher responses reached 91.66%, categorized as highly practical. The findings indicate that Smart Letter Box is an engaging, interactive, and developmentally appropriate medium for supporting children's early literacy development.]]>
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