COMPUTER INFORMATION SYSTEMS harness the processing power of the computer to collect and organize data and make it easily accessible to the businessman, scientist, or other user who needs it. A computer information system may be thought of as a set of applications programs using common data bases through a data management system, as shown in Fig. 1. The data management system is composed of two separate software entities: the operating sys tem and the data base management system. In the past it has been generally accepted that com puterized information systems and, similarly, data base management systems, required large-scale com puters. But as computer performance has expanded, the conventional concept of a data base managemen
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