The Accelerated Reader program is designed to provide a clear pathway
for children to improve their reading skills. Books in the program are
assigned numeric values for their interest level and their "book level." The
book level score represents the difficulty of the text, presented in grade
aligned numbers so that a book with a BL of 5.5 would be appropriate for
the average fifth grader in the fifth month of school. Each book is also
assigns points, so you can set goals and reward students who achieve the
desired amount of reading.