The Raz-Kids levels correlate to the reading levels of the books that the program uses. The levels go from AA to Z, with AA being the easiest and Z being the most difficult level based on the complexity of the text. The Raz-Kids levels take into account qualitative measures, quantitative measures and specific reader skills. Teachers use assessments provided by Raz-Kids and their personal judgment to choose levels for students.
The purpose of the Raz-Kids levels is to have students read at appropriate levels. Books that are too easy or too difficult don't help a child improve her reading skills. As students gain reading experience, they move through the Raz-Kids levels to continue challenging themselves.
The qualitative measures used to assign a level to a book relate to text attributes such as the author's purpose, meaning of text and language conventions. These concepts are more subjective than the quantitative measures. Quantitative measures are statistics about the text and include factors such as number of words, sentence length and sentence complexity.
While each child is different, the Raz-Kids levels roughly correspond to a child's age and grade level. Levels AA to C generally work for kids aged 4 to 6 in kindergarten. Levels V to Z are typical for kids aged 9 to 11 in fourth or fifth grade. The Raz-Kids program also correlates its levels to other reading programs such as Fountas & Pinnell, Reading Recovery and Lexile Levels. Raz-Kids levels AA to C are roughly the same as Lexile level BR-70.