Action Research on Mobile Learning as an Additional Media to Increase of English Vocabulary Skills

The study conducted classroom action research to enhance students' vocabulary understanding using Mondly as an additional learning tool, alongside traditional methods. It employed both qualitative and quantitative approaches, involving 20 students from class XII B at Madrasah Aliyah Nahdatul Wathan in the academic year 2024/2025. The research methodology included a pre-test to establish baseline knowledge, a post-test to measure improvement after implementing Mondly, and observations by researchers and English teachers to gauge student participation and engagement. Results indicated a pre-test score of 66.4% and a post-test score of 76.8%, showing a 10% improvement. Observations showed an increase in student activity from 65% to 75% between the first and second meetings. Conclusively, Mondly proved effective as an additional learning medium due to its engaging features, which kept students motivated and active in the classroom. These findings suggest that integrating Mondly into classroom instruction can positively impact students' learning outcomes in vocabulary.