Interactive video: is it all talk, or is somebody out there actually doing something? Having discussed theoretical and technical questions in this series in past months, I would now like to describe some practical applications. If you attended EPIC's Interactive Video Briefing in London in November, you heard about a number of pilot projects, here and in America — and saw three demonstrated. The theme of the briefing was ‘Practice Not Theory’, and the day included presentations, in graduated degrees of complexity, on three pilot projects currently under way in Britain. The Royal Military Police demonstrated the tape‐based Sony Responder; Smith Kline & French introduced their videodisc, produced by EPIC, for use on the Pioneer PR‐7820 disc player with micro‐processor onboard; and the University of Wales Institute of Science and Technology (UWIST) unveiled a project undertaken for Texaco Overseas Tankship to produce an interface between the Pioneer disc player and an external Commodore PET micro‐computer. Let's just recap on these to begin.