Study into the development of English textbooks is still at an early stage, and thus researchers tend to depend on qualitative study, such as reviewing, or qualitative analysis. Qualitative analysis has never been challenged in this area because of the large amount of materials and the lack of a standardized comparative method. This study introduced a new method of quantitative analysis, using computer software. In this study, we digitized all of the materials and then analyzed them in terms of the frequency of the vocabulary, their readability, and the frequency of the use of the relative clause and the passive voice. This study focused on the post-war English textbooks called New Jack and Betty: Step by Step, High School English, and Sunshine English Course, referring to the quantitative data of the textbooks published in the Meiji and Taisho Periods, i.e., The National Readers, The Globe Readers, and The Standard English Readers, used in Umamoto et al. (2001). In so doing, we believe that characteristics of the post-war English textbooks can be clarified and seen more objectively, and also that the present analysis will contribute to the historical study of the development of English textbooks in Japan.
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