Entitled This Surprising Reading Level Analysis Will Change the Way You Write is fascinating. Take a look at the charts and graphs to see how reading level and reading ease can affect how a book is "ranked" and quantified. Coupled with my post from yesterday (the original blog post is also by this author), it presents an interesting flip side: the author's perspective.
Would we rather kids struggle with text for the sake of "rigor" by number? Or would we prefer that readers access the text, gain something from it, and perhaps move on to another book and another and another? If I get to vote, you know which I select, right?