It is always difficult to keep on track of work that students have completed and have not. I love this idea from First Grade Garden. I have a pickles bin on the top of the group bookshelf for complete work. Students will have a ketchup folder in their desk for incomplete work. They will also use this same system in their center folder. We then have "Chip Time" at the end of the week. Students who are complete work (Pickles) get to do free centers, and ketchup students have to catch up on their work.