The two 5th grade volumes of McGraw-Hill's Treasures reading series at first glance look remarkably similar.
Both include, for instance, a nonfiction selection about a scientific mission to Antarctica, coupled with snippets from a researcher's journal. But there are subtle differences in what they ask students to think about as they read. The older edition, from 2008, merely asks them to explain the value of keeping a journal. The newer one, from 2011, asks the students to explain how "sensory details and other language" differ between a primary source, such as the journal, and a secondary source, such as the narrative. (Stephen Sawchuk at Education Week)