I think the analogy of looking at a book for it's words is somewhat misguided. Judging a book by the words it contains is wrong if you're judging literature, b

I think the analogy of looking at a book for it's words is somewhat misguided. Judging a book by the words it contains is wrong if you're judging literature, but when you're choosing books to teach with, you have to consider the readers vocabulary. In practice, choosing a book based on it's words is, in fact, quite common when you're teaching english.