Prestel, Oracle, and Ceefax are telephone based video text systems currently in use in Great Britain. Rather than being considered as competitors, they should be viewed as complementary media with separate functions based on their differences. All use home television sets to receive information in print, and all broadcast on spare TV lines in the…

A system which lists current research in Israel in the natural sciences, medicine, agriculture and technology was inaugurated in 1967. This system now includes 4,000 current research projects on which 3,500 individual researchers are engaged. This represents about 90% of all scientists doing non-defense research in Israel. The system is run on an…

This theme issue focuses on the development of telephone-based videotex systems that use television sets and the telephone with the addition of a simple keyboard to access banks of information available on computers and to receive information in print on the television screen. A series of articles are included on Prestel, a telephone-based…