The Mustard MUST DO visual is used for essential tasks. The Mayonnaise MAY DO visual is used for free choices such as centers or workstations. BONUS: Use the Ketchup Catch Up visual for students with work to make up. This set includes three convenient sizes for bulletin boards (large), center or workstation baskets (medium), and student folders or behavior incentive charts (small). Print on cardstock and laminate for longevity! I also have Velcro around my room to quickly interchange the options. HAVE FUN!