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.