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Day and Bamford present ten top for extensive reading. The use of the word principle implies that these assertions should be valid for all settings where extensive reading is practiced. I would like to argue, however, that in Japan and probably in many other countries, adherence to some of these principles might undermine the primary intent of ER, which is to have our students read more in order to increase their exposure to syntax, lexis and perhaps culture of the target language.
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Tom Robb (2002) studied this question.