The document discusses the concept of the "BIG Idea" in reading. It defines the BIG Idea as articulating the author's underlying message or ideas about the central topic or theme of a work, which may not always be explicitly stated. It provides examples of how fiction and nonfiction works convey BIG Ideas, with fiction revealing the core theme by the end, and nonfiction connecting different topic sections to the author's overall idea. The document advocates teaching readers to analyze different pieces of information to understand the whole BIG PICTURE of what they are reading.