ABSTRACT
Teletext is an electronic data distribution method, using broadcast and/or cable as the transmission media. The data are organized into pages, which may contain text and graphic symbols. Teletext in its present form is restricted to a static visual presentation but can, in principle, be extended to deal with dynamic images, accompanied by sound, which are more suitable in an educational setting. That development, however, removes the cost advantages of teletext, since teletext is currently an add-on facility to TV and radio thus making marginal use of the existing bandwidths. It would require dedicated educational broadcast or cable channels for teletext to be used with dynamic images accompanied by sound. There is one major technical development which is likely to boost the use of teletext in a wide range of applications, including education: an increase in available transmission channels, due to satellite broadcasting and broad-band cabling.
