"We have three cards on a ring. A red card, which stands for I do not understand), a yellow card (which stands for I kind of get it, I need a little help) and a green card (which stands for I understand, I'm good to go.) It was introduced on the first day as a way to ask for help or extra time." By Elena Padilla & Lynette Pitcher, Middle School Science @ High School for Teaching and the Professions