This study examines the importance of high-quality teaching materials, particularly textbooks, in achieving English language learning objectives in Indonesia. Textbooks play a crucial role in the Merdeka Curriculum. Therefore, this study aims to analyze the feasibility of the English textbook “English for Nusantara” for eighth-grade junior high school students at SMP Negeri 1 Gunungsitoli Barat, by evaluating its content against Brian Tomlinson's 16 criteria for teaching materials. Employing a Qualitative approach with content analysis on Chapters 1-5, the findings revealed that the textbook substantially meets the criteria, with 14 criteria fulfilled and a high match percentage of 87.5%, placing it in the "Good" category. The two less-fulfilled criteria concerned drawing students’ attention to linguistic features and specific aspects of right-left brain stimulation. Overall, the results indicate the textbook is of adequate and effective quality, providing a systematic structure for grammar and vocabulary, and containing relevant, varied, and high-impact activities. This study contributes valuable input for educators and curriculum developers to improve the quality of teaching materials and optimize student learning outcomes in English.
Lase et al. (Wed,) studied this question.