"Building knowledge through content rich non--fiction plays an essential role in literacy and in the Standards. In K--5, fulfilling the standards requires a 50--50 balance between informational and literary reading. Informational reading primarily includes content rich non--fiction in history/social studies, science and the arts; the K--5 Standards strongly recommend that students build coherent general knowledge both within each year and across years. In 6--12, ELA classes place much greater attention to a specific category of informational text—literary nonfiction—than has been traditional. In grades 6--12, the Standards for literacy in history/social studies, science and technical subjects ensure that students can independently build knowledge in these disciplines through reading and writing. "