Books at Reading Level (BL)
Reading Level Explanation
Reading/Book Levels (BL) from Renaissance Learning at www.ARBookFind.com - Book Level (BL)
Per explanation by Renaissance Learning, ATOS Book Levels are reported using the ATOS readability formula and represent the difficulty of the text. For example, a book level of 4.5 means the text could likely be read independently by a student whose reading skills are at the level of a typical fourth grader during the fifth month of school.