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The period is divided by the author into three main time scales; the 50's (prelude), the 60's (overture) and the 70's (intermezzo). The prelude stage was mainly concerned with organised administration, developed from the Hollerith punched card. The work of the IBM 'think team' is quoted; this produced RAMAC 305 and RAMAC 1401. There were few instruction manuals and progress was mainly step by step. The overture stage seems mainly to have been dominated by increasing size and capacity of hardware, improvements in integrated circuits and the perfection of peripheral equipment. The intermezzo period has witnessed software development, expansion into fields of management control, production planning, integrated multiple programmes and the development of data-bases, the micro-computer and micro-processor.