I've heard of the 5 finger test: Children open up to any page in the book and start reading. When they get to a word that they dont know, they count 1. If there are 5 words that they don't know on 1 page, then the book is too difficult right now. I think that its good for kids to be able to recognize if a book is a good match for them so I wanted to suggest this for a 6th grader that I am working with. But I wanted to check: Does this "test" apply across all grade levels? Or are older students expected to be able to read books that have more words that are difficult for them? My gut says that any more than 5 difficult words could reach frustration level at any grade. What do you think?