The broadcast media has, until relatively recently, been a primarily one-way system, with passive viewers and fixed schedules dictated by the limits of the broadcasting technology. Already this is beginning to change. More viewers are participating in phone-ins and quizzes, and providing feedback by writing or phoning to complain or praise. Though this feedback has always happened to some extent, it is an increasingly important part of our viewing habits. The Internet will take this further, allowing fast immediate feedback on broadcast programmes, and greater choice as audio- and video-on-demand become available. And with the increasing numbers of channels available on satellite, cable and digital TV and radio, viewers need on-demand programme listings and reviews.