<![CDATA[The purpose of this research and development is to produce a Syllable Adventure Media that is feasible and effective in facilitating the vocabulary mastery needs of early-grade students. The time and place of this field research was conducted at UPT SDN Kalipucung 03, Sanankulon, Blitar Regency, East Java Province, within a nine-month period from October 2025 to June 2026. The research method used is Research and Development (R&D) by applying the ADDIE development model (Analyze, Design, Develop, Implement, Evaluate). The population and sample for the field testing involved 13 first-grade students of UPT SDN Kalipucung 03. The research instruments and data collection tools used included non-test instruments consisting of validation sheets from material experts, media experts, and learning practitioners, as well as test instruments in the form of oral performance tests with a pre-test and post-test scheme. The data analysis technique used a combination of descriptive statistical percentage analysis to measure product validity and inferential statistics through the calculation of the Normalized Gain (N-Gain) score assisted by SPSS software. The results showed that the Syllable Adventure Media was declared highly valid, with feasibility percentages of 100% from material experts and 92% from media experts. Furthermore, this media proved to be highly effective in significantly increasing students’ vocabulary mastery, as demonstrated by a sharp increase in the total score from 970 (pr-test) to 1,255 (posttest) and an average N-Gain score of 0.86, which falls into the high category.]]>
