This is a great exercise to get students involved the very first day. It has them moving and communicating, but silently! I have used this for several years in my high school English classes and my college Speech classes, and it works very well. When you have finished this exercise, take a wide angle picture of the alphabetized class. Add the name of each student to the picture and you can quickly associate a picture with a name. Put the picture with names on your desktop computer as a screensaver and you use it to identify your students. At the end of the course offer the pic file to students as a classroom momento.