Abstract:
The purpose of this research is developing Flashcard learning media to improve students' vocabulary mastery in English subjects. The type of research used is R&D (Research and Development) with a 4D development model namely define, design, develop, and disseminate. Data collection techniques include observation, documentation, interviews, questionnaires, and tests. The results of the feasibility validation from media experts obtained a score of 99.2%, material experts 95.33%, and student responses 98.06%
indicating that Flashcard is included in the very feasible category. The results of students' vocabulary mastery obtained an average pre-test score of 60.5 increasing to 86.3 at the time of the post-test with paired sample t-test scores showing that t-count>t-table, namely 11.682>2.045 and Sig. (2 tailed) = 0.000<0.05 which means there is a significant difference between the pre-test and post-test results. Thus, Flashcard learning media is very feasible to use and can improve students' vocabulary mastery in English subjects.
