Each of the past three centuries has been dominated by a single technology. People were doing lot of paper work in organizations because, lack of advance systems which will help them in their day today work. The 18th century was the time of the great mechanical systems accompanying the Industrial revolution. Computer industry has made spectacular progress in short time. During the first two decades of their existence. Computer systems were highly centralized, usually within the single large room. A medium size company or university might have had one or two computers, white large institutions had at most few dozen. The idea that within 20 years equally powerful computers smaller than postage stamps would be massproduced by the millions was pure science fiction.

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