How fortunate that Becky mentioned Accelerated Reader in Friday's comments, since I wanted to mention it today, anyway.
When lexiles came up the other day, I did think of Accelerated Reader, a computer program that provides some kind of reading instruction used in many schools. I don't know if The Lexile Framework for Reading includes any kind of reading instruction, but the connection in my mind came about because Accelerated Reader attaches a grade level to book titles and the Lexile Framework attaches a number.
I know nothing about Accelerated Reader as a parent or an educator, so it would be inappropriate for me to make any kind of judgment about it. In fact, I know so little about Accelerated Reader that I would be hard put to come up with enough thoughts to make an inappropriate judgment.
However, for those who are interested, I have heard about children's writers wanting to get their titles into the Accelerated Reader system, hoping that that would improve their books' chances for sales with school systems that use the Accelerated Reader program. You could call that AR from another angle, an angle that has nothing to do with the quality of the program.
By the way, all my books are AR titles, including both volumes of The Hannah and Brandon Stories.