If a student is having difficulties finding the main idea, remind them that the main idea is the concept that is repeated throughout the passage. The supporting details have to support the main idea; they have to be ideas that are related to the main idea. The graphic organizer is shaped like a house to reinforce the idea that the roof needs to be supported by the columns (the main idea has to be supported by the details).
Please see Main Idea graphic organizer attachments 1, 2, and 3 as different options for students to use to record their information. Teachers can provide feedback on the organizers as needed to help students further their understanding of main idea and details in the text they are reading.