3. Advantages and Disadvantages of Distance Learning

Technological aides to education
One of the first technological aides to education was the lantern slide (e.g., the Linnebach lantern), which was used in the 19th century in chautauqua classes and lyceum schools for adults and in traveling public-lecture tent shows throughout the world to project images on any convenient surface; such visual aides proved particularly useful in educating semiliterate audiences. By the start of the 20th century, learning theories had begun concentrating on visual approaches to instruction, in contrast to the oral recitation practices that still dominated traditional classrooms.
The first significant technological innovation was made by the American inventor Thomas Edison, who devised the tinfoil phonograph in 1877. This device made possible the first language laboratories (facilities equipped with audio or audiovisual devices for use in language learning). After World War I, university-owned radio stations became commonplace in the United States, with more than 200 such stations broadcasting recorded educational programs by 1936.
Edison was also one of the first to produce films for the classroom. Many colleges and universities experimented with educational film production before World War I, and training films were used extensively during the war to educate a diverseand often illiterate population of soldiers in a range of topics from fighting technique to personal hygiene. Improvements in filmmaking, in particular the ability to produce “talkies,” were put to use just before and during World War II for technical training and propaganda purposes. While the most artistically acclaimed propaganda production may have been Triumph of the Will (1935), one of a series of films made by Leni Riefenstahlduring the 1930s for the German Nazi government, similar films were produced by all the major belligerents. In the United States the army commissioned Hollywood film director Frank Capra to produce seven films, the widely acclaimed series Why We Fight(1942–45), in order to educate American soldiers on what was at stake.
Instructional television courses began to be developed in the 1950s, first at the University of Iowa. By the 1970s community colleges all across the United States had created courses for broadcast on local television stations. Various experiments in computer-based education also began in the 1950s, such as programmed or computer-assisted instruction, in which computers are used to present learning materials consisting of text, audio, and video and to evaluate students’ progress. Much of the early research was conducted at IBM, where the latest theories in cognitive science were incorporated in the application of educational technology. The next major advancement in educational technology came with the linking of computers through the Internet, which enabled the development of modern distance learning.