Grammar is one of the important components of English but many students find it difficult to understand it, including students of MAN 5 Jombang. The researcher conducted a study by implementing the RADEC learning model (Read, Answer, Discuss, Evaluate, Create) which aims to improve the understanding of "grammar" in the material of interactional transactional text. RADEC is a new learning model created by lecturers at UPI Bandung which is adjusted to the current era of education in Indonesia. This article is a best practice that proves that the RADEC learning model has succeeded in improving students' understanding of "grammar" with evidence that all student scores have increased.
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