Why are the books organized by grade-level span instead of by a single grade level?
The list is organized by grade-level span designations indicating the appropriate audience for a particular title. Grade-level spans are determined by many factors, such as interest level, curriculum connections, and readability level. Titles have been divided into the following grade-level spans: kindergarten through grade two (K-2), grades three through five (3-5), grades six through eight (6-8), and grades nine through twelve (9-12).
