Developing textbook material is a crucial component of any curriculum, which should be based on sound and systematic techniques. In a detailed view, considering the importance of knowing English not only as an international language but as the language of commerce, tech and science, English course needs to be programmed efficiently to provide a suitable circumstance of learning for learners. In this regard, the present study is to develop a new English textbook for Iranian Senior High Schools to provide an opportunity for high school students as well as teachers to be actively engaged in the text, questions, and images of the textbook based on William Rummy’s Technique to keep up with the developments of the field. The results of the study demonstrate demonstrates that the involvement index is appropriate enough to actively engage the learners in the newly developed English textbook. That is, the texts, questions, and images within the textbook are suitably developed to engage the students actively. Manuscript profile

As developing material is an ongoing process that needs to be analyzed in a multidimensional manner, the present study focuses explicitly on English Textbook Vision3 in Iranian senior high schools to investigate to what extent this English textbook involves the domains of learning objectives defined by Benjamin Bloom’s Taxonomy (1985) each of which contains several subcategories investigated through the study in details. Considering gained tables on analyzing Information Load and Significance Factor of the English textbook Vision3 (Student’s and Workbook) within cognitive, affective and psycho-motor domains of Bloom’s Revised Taxonomy using Shannon Entropy Method, it is concluded that regarding cognitive domain,“Evaluation” in the first, “Application” in the second, “Synthesis” in the third “Knowledge” in the fourth, “Analysis” in the fifth and “Comprehension” is in the sixth place of significance and none of six defined cognitive subcategories are neglected within developing the textbook as the last English textbook of senior high school program in Iranian Educational Curriculum. However, statistical results show that among affective domain’s subcategories only“Responding” and “Receiving” are put into practice, while higher levels of affective domain including “Valuing”, “Organizing” and “Characterization” are neglected throughout the both student’s and the workbook. Furthermore, studying the psycho-motor domain of the considered English textbook it seems that “Guided Response”, “Mindset” are the only subcategories which are noticed through strategies In general, tables reveal that the most frequent involved domain among Bloom’s Revised Taxonomy belongs to cognitive one and the other two domains (affective and psychomotor) play little role through their higher subdivisions. Manuscript profile