<![CDATA[This study develops and evaluates a web-based Sundanese language learning platform for fifth-grade elementary students using a User-Centered Design (UCD) approach. Context-of-use data were collected through observations and interviews involving 14 students and one Sundanese language teacher, then translated into user needs, functional and non-functional requirements, interface designs, and system features. The platform was developed using React.js, Vite, Express.js, and SQLite. Functional testing of 18 test cases showed that all functions operated as specified. Usability evaluation involved 10 students completing nine tasks, resulting in 90 student-task observations. Of these, 76 tasks were completed without recorded obstacles, yielding an independent task-completion rate of 84.4%. Concurrent think-aloud evaluation identified difficulties in feature discoverability, quiz answer-selection feedback, and content-management guidance. The findings demonstrate that functional correctness alone does not guarantee usable interaction for child users and provide specific implications for redesigning regional-language learning platforms.]]>
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