At least in our school district, this is not how its done in elementary school. Teachers don't assign books. Either it's completely free choice, or fiction/no

At least in our school district, this is not how its done in elementary school. Teachers don't assign books. Either it's completely free choice, or fiction/non fiction, or genre (e.g. mystery). When I last read about this, it was blamed on 4th grade being the time when you shift from reading just to read, into reading to learn.