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This study was an attempt to evaluate Iranian high school English textbooks in terms of vocabulary, grammatical structures and compatibility between reading comprehension texts and grammar exercises. Readability formula and experts’ judgment were used to ensure that high school textbooks, English American headway and English American file books were at the same level of difficulty .The findings revealed that, there were a significant lack of compatibility between the grammatical structures and reading comprehension passages in each lesson and also between high school textbooks and English American headway and English American file books in terms of the order of presentation and content.

A Study of Iranian High School English Textbooks Based on the Standard Criteria