Just Right Books

A "just right book"
1. choose a book
2. open to the middle of the book
3. start reading
4. If you come to a word you don't know, put one finger down (pinky first)
5. If you put your thumb down (5 words the bookis too hard) choose another 
book

If a book is "just right" then you are interested in it, you understand it, 
and it flows.