Plato

PLATO, an apronym for Programmed Logic for Automatic Teaching Operation, was one of the first generalized Computer assisted instruction systems, originally built by the University of Illinois (U of I) and later taken over by Control Data (CDC), who provided the machines it ran on. PLATO ran for many years at the U of I, but William Norris's plans to make it a major force in the computing world and a keystone of corporate social responsibility failed. Although the project was economically a failure and supplanted by other technologies when it was finally turned off in the 1990s, PLATO nevertheless pioneered key concepts such as online forums and message boards, online testing, email, chat rooms, picture languages, instant messaging, remote screen sharing, and multiplayer online games.

The CDC years

As PLATO IV reached production quality, William Norris became increasingly interested in it as a potential product. His interest was two-fold. From a strict business perspective, he was evolving Control Data into a service based company instead of a hardware one, and was increasingly convinced that computer-base education would become a major market in the future. At the same time, Norris was upset by the unrest of the late 1960s, and felt that much of it was due to social inequalities that needed to be addressed. PLATO offered a solution by providing higher education to segments of the population that would otherwise never be able to afford university.

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Norris provided CERL with machines to develop their system on in the late 1960s. In 1971 he set up a new division within CDC to develop PLATO "courseware", and eventually many of CDC's own initial training and technical manuals ran on it. In 1974 PLATO was running on in-house machines at CDC headquarters in Minneapolis, and in 1976 they purchased the commercial rights in exchange for a new CDC Cyber machine.

Related Topics:
Minneapolis - CDC Cyber

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CDC announced the acquisition soon after, claiming that by 1985 50% of the company's income would be related to PLATO services. Through the 1970s CDC tirelessly promoted PLATO, both as a commercial tool and one for re-training unemployed workers in new fields. Norris refused to give up on the system, and invested in several non-mainsteam courses, including a crop-information system for farmers, and various courses for inner-city youth. CDC even went as far as to place PLATO terminals in some shareholder's houses, to demonstrate the concept of the system.

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In the early 1980s CDC started heavily advertising the service, apparently due to increasing internal dissent over the now $600 million project, taking out print and even radio ads promoting it as a general tool. The Minneapolis Tribune was unconvinced by their ad copy and started an investigation of the claims. In the end they concluded that while it was not proven to be a better education system, everyone using it nevertheless enjoyed it at least. An official evaluation by an external testing agency ended with roughly the same conclusions, suggesting that everyone enjoyed using it, but it was essentially equal to an average human teacher in terms of student advancement.

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Of course a computerized system equal to a human should have been a major achievement, the very concept that the early pioneers in CBT were aiming for. A computer could serve all the students in a school for the cost of maintaining it, and wouldn't go on strike. However CDC charged $50 an hour for access to their data center, in order to recoup some of their development costs, making it considerably more expensive than a human on a per-student basis. PLATO was therefore a failure in any real sense, although it did find some use in large companies who didn't want to staff up their teaching departments.

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An attempt to mass-market the PLATO system was introduced in 1980 as Micro-PLATO, which ran the basic TUTOR system on various home computers. Versions were built for the Texas Instruments TI-99/4A, Atari 8-bit family, Zenith Z-100 and (later) IBM PC. Micro-PLATO could be used stand-alone for normal courses, or could attach to a CDC data center for multiuser programs. To make the later affordable, CDC introduced the Homelink service for $5 an hour.

Related Topics:
Texas Instruments TI-99/4A - Atari 8-bit family - Zenith Z-100 - IBM PC

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In 1986 Norris stepped down as CEO, and the PLATO service was slowly killed off. He tirelessly supported it to the end, announcing that it would be only a few years before it represented a major source of income for CDC as late as 1984. Nevertheless he later claimed that Micro-PLATO was one of the reasons PLATO got off-track. They had started on the TI-99/4A, but then TI pulled the plug and they moved to other systems like the Atari, who soon did the same. He felt that it was a waste of time anyway, as the system's value was in its online nature, which Micro-PLATO lacked (at least to start).

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Bitzer was more forthright about CDC's failure, blaming their corporate culture for the problems. He noted that development of the courseware was averaging $300,000 a module, many times what the CERL was paying for similar products. This meant that CDC had to charge high prices in order to recoup their costs, prices that made the system unattractive. The reason, he suggested, for these high prices was that CDC had set up a division that had to keep itself profitable via courseware development, forcing them to raise the prices in order to keep their headcount up during slow periods.

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