Integrating Learning to Argue and Arguing to Learn Instructions: Enhancing English Language Proficiency and Argumentative Writing of EFL Learners

: Argumentative writing has increasingly gained attention in EFL writing, though EFL learners generally have deficiencies in this writing. English language proficiency is one of the main factors that can undermine EFL argumentative writing quality. Integrating learning to argue and arguing to learn instructions along with classroom debates were employed in EFL argumentative writing classes for the 11-week online course. This study aimed to investigate the intervention's effect on the argumentative writing performance and English language competence of Myanmar EFL learners. Twenty-six Myanmar undergraduate students voluntarily engaged in the experiment. The Versant English Placement Test and argumentative writing were administered as pre-and post-tests of this study. The results showed that the integrated instruction could enhance both English language competence and argumentative writing performance of the EFL learners and significant correlations between the gains of certain argumentative elements and English language development. These findings contribute to the implementation of integrated instructions in the EFL context.