This study aimed to investigate the development of textbooks and also to figure out their validity, practicality, and effectiveness, in indonesain education system. In the case of textbook validation, it is performed by three validators. In order to measure the practicality of the textbooks, it was tested in 3 high schools in the year 2022/2023 through student response questionnaires and teacher response questionnaires. Mexanwhile, the effectiveness of textbooks was tested in class XI first-grade students of three high schools in Banda Aceh in the year 2022/2023. Based on the results of the trials that have been carried out, it was concluded that the textbooks have met a very valid category with an average value of 4,032 by relying on the criteria table validity (4≤M<5). For the practicality of textbooks, it can be seen that 92.59% of the students gave vastly positive responses, and 95% of the teachers gave very positive responses in relation to the textbooks used for learning. Furthermore, to find out the effectiveness of textbooks can be seen in the student learning outcomes test. There are 47 students in total, 39 students were declared complete (passed) and 8 students were declared incomplete (did not pass) with the average percentage of the number of students who achieved a minimum completion score of 75 was 83 %. Based on the results of this study, indicated that the textbooks developed were valid, practical, and effective to be used in order to support the teaching and learning process.
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