In 1977, almost 60 percent of all Open University courses were using audio and visual media in combination: either sound broadcasting with visual materials or audio-vision with the sound distributed on cassette or discs. Research has shown that students prefer radio-vision to radio alone. It appears that future growth may be in the area of audio-vision and away from dependence on radio as the sound source. This is the result of a growing need to cater to the individual learner and to optimise the learning opportunity. It is possible that the growth of audio-vision will enable radio to develop a more appropriate and significant learning role. Research relating to radio-vision and audio-vision is described. (Author/STS)