Text readability assessment stands as a fundamental component of foreign language education because it directly determines students' ability to understand their course materials. The ability of current tools, including ChatGPT, to precisely measure text readability remains uncertain. Readability describes the ease with which readers can understand written material, while vocabulary complexity and sentence structure, along with syllable numbers and sentence length, determine its level. The traditional readability formulas rely on data from native speakers yet fail to address the specific requirements of language learners. The absence of appropriate readability assessment methods for foreign language instruction demonstrates the need for specialized approaches in this field. This research investigates the potential use of ChatGPT to evaluate text readability for foreign language students. The examination included selected textbooks through text analysis with ChatGPT to determine their readability level. The obtained results were evaluated against traditional readability assessment approaches and established formulas. The research aims to establish whether ChatGPT provides an effective method to evaluate educational texts for foreign language instruction. The research evaluates ChatGPT's capabilities beyond technical aspects. The study examines how this technology may influence students' learning experiences and outcomes. The text clarity evaluation capabilities of ChatGPT might lead to innovative approaches for developing educational tools. The implementation of this approach would generate lasting benefits for educational practices in schools. For example, ChatGPT’s readability classifications correlated strongly with Flesch-Kincaid scores (r = .75, p < .01), and its mean readability rating (M = 2.17, SD = 1.00) confirmed its sensitivity to text complexity.

Learning to read constitutes one of the most important cognitive abilities students acquire during their education, and teachers’ knowledge of reading instruction is considered significant to teaching quality and students’ achievement. This paper aims to systematically review the existing research on teacher knowledge of reading instruction over the past six years, following the PRISMA statement’s guidelines, to identify the current research trends, areas of research, and research gaps. Three main research areas are identified in the 22 reviewed articles, namely (a) Teacher knowledge (TK) exploration, (b) TK assessment, and (c) TK development. More specifically, research on TK exploration includes sub-themes such as examining TK, investigating the relationship between TK and practice and student achievement, and influencing factors of TK. TK assessment includes research on the development and validation of more comprehensive measurement tools to assess teachers’ content knowledge and pedagogical content knowledge of reading instruction. TK development involves the effectiveness of interventions on TK of reading instruction in teachers’ professional development programs. Future studies are recommended to use a more diverse range of methods, including both quantitative and qualitative approaches to study teachers’ knowledge in their classroom practice, and to focus on teachers’ active role as knowledge constructors. Studies in L2 reading contexts are also recommended.