This main idea graphic organizer is useful for students to document the critical concept and information contained within each paragraph or topic. Students may find it difficult to structure an essay at times. On the other hand, students can use a central idea graphic organizer to create an outline that will help them to understand the topic better. In other words, it is an advanced reading technique that should be used when reading a book. Taking notes is similar to using this main idea graphic organizer. Like many other graphic organizers, it's a structured way to record thoughts, feelings, and concepts.