This video is based on the talk given by M. Seppälä at the JEM Workshop in Barcelona on June 9, 2009. The video discusses the potential of Real Time Quizzes in class rooms, and describes the TSARQ system, developed by the WebALT Company, which allows the instructor to administer quizzes to which students respond by sending SMS messages with their cellular telephones. This is a very powerful notion, and allows one to integrate Assessment for Learning to instruction in a completely new way. The WebALT Team, Dr. Lebedev, Dr. Caprotti and Dr. Pauna, is responsible for the work presented here.