Studies of the pauses between teachers' questions and students' responses have indicated that lengthening wait-time produces significant improvement in intellectual performance. Two types of pauses have been identified: the pause after teachers pose questions and students respond, and the pause that takes place when students hesitate momentarily in their replies. Typically, pauses between teacher and student remarks average approximately 1 second. Even though 3-second pauses in classroom interaction have been shown to be important, most efforts to train teachers to use wait-time effectively have met with little success. An electronic device, which provides automatic, continuous monitoring of pauses in classroom dialogue, consists of voice-activated switches, a variable timer, and a system of red and green lights. A red light is activated when a person is speaking, while a green light signals whenever sustained silence occurs. Field testing has indicated that using the device helped teachers to prolong wait-time in questioning. A diagram of a "wait time feedback" device is included with the description. (JD)