Students can use these during shared reading or read alouds. The object is to show students that good readers sometimes have to reread a page or sentence because they may make mistakes. The teacher can read a page and make a mistake somewhere, in which case students would raise their "Reread it!" signs in the air to signal the mistake. I have them printed, laminated them, and glued them on popsicle sticks! Could be used during guided reading, as well.