Despite coverage of materials development principles in the applied linguistics literature, principled production of open textbooks has not received attention. To address this gap and demonstrate the interdisciplinary potential of materials development research, the authors drew upon concurrent verbalization and interview data they collected while…

This paper analyzes writing tasks in academic writing textbooks for Japanese university students, focusing on the organization and difficulty of these tasks based on the Common European Framework of Reference for Languages (CEFR). A total of 411 writing tasks from 30 textbooks were coded by two experienced Japanese English teachers. The author…