Tools like Fist to Five, (where students put up a fist for 0 and all their fingers to represent a 5), ABCD, (students hold up cards with identifiers to answer questions or rank understanding), and Thumbs, (students hold a thumbs up, middle or down) are all very fast ways to get data from your class, or from specific individuals. There are nearly infinite variations on this tool, so create your own version for your class!