This is a great article to keep in your library for future reference. Mr. Finn writes about the US lag behind other countries and suggests that maybe this is happening because we spend 30% less time in school. However, he also makes a strong point that we waste a lot of instructional time getting prepped, going to recess, enforcing classroom rules, (you teachers know what he means!).
The Wall Street Journal only allows these links for seven days to non-subscribers.
The Case for Saturday School