There are other media which we have not discussed in this section, because they are new, expensive, complex to use, and not widespread. They include: radio, computer-aided learning, multimedia, and information via satellite.
Radio programmes can be broadcasted on a national or institutional scale. The medium reaches many people, but involves extensive planning to produce valuable material.
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Multimedia learning is computer-assisted where powerful computers capable of showing text, diagrams (graphics), sound and motion are needed. A computer with multimedia capability costs about 50 % more than an equivalent regular computer.
This method uses computers to send and receive information via phone lines or satellite (electronic mail). For example, you can get a journal article from any country within minutes.