Idea — A text is appropriately graded when learners understand roughly 95% of the words — enough challenge without overload. Below that threshold, learners stop reading for meaning.
Example — Nation’s vocabulary research suggests one unknown word per 100 known words for fluency reading; up to five per 100 for vocabulary growth.
Try — Count unknown words in a text you plan to use. Is it within the 95% comprehensible zone?
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