This research is about the use of the Kepham English Pronunciation application to help students of grade V elementary school in improving the accuracy of the pronunciation of vowels and consonants. The key in English communication is clear and accurate pronunciation, but many students experience difficulties because of the differences of the sound system between Indonesia and English and the way of learning that does not emphasise the phonological aspect. This research uses a quantitative approach with a quasi-experimental design, namely the experimental group that practices using the Kepham application and the control group that learns using conventional methods. The data were collected by pre-test and post-test and analysed statistically. Results of the study showed significant improvement in experimental group as compared to control group. Speaking ability of the students improved from “fair” to “good” category where the difference was statistically proven significant. Furthermore, the app has interactive exercises and automatic feedback that makes it easier for students to study independently, so they are more motivated and confident. Thus, the application of Kepham English Pronunciation was successful in improving the accuracy of vowel and consonant pronunciation and in promoting more adaptive and student-centered technology-based learning.
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