The typical school has 1 computer per 20 students, a ratio that computer educators feel is still not high enough to affect classroom learning as much as books and classroom conversation. Some critics see computer education as merely the latest in a series of unsuccessful attempts to revolutionise education through the use of audio- and visually-oriented non print media. For example, motion pictures, broadcast television, filmstrips, audio recorders, and videotapes were all initially heralded for their instructional potential, but each of these ....