Information Reference Coding Items in business systems have to be identified by reference codes, which can later be used as data codes and file keys in an associated data processing system. In business systems associated with large collections of integrated files (database) it is vital to assign codes in a methodical way so as to control future extension and changes while maintaining correct program action. The principles of methodical coding are discussed, and the way in which logical connections between data items must be reflected in the reference code framework is shown through a set-theoretic information model. CACM January, 1976 Florentin, J. J. data, file, reference code, systems analysis, information modeling, database 3.50 CA760105 JB January 5, 1978 10:11 AM 1135 4 2888 1136 4 2888 2155 4 2888 2406 4 2888 493 4 2888 2710 4 2888 2710 4 2888 2715 4 2888 2716 4 2888 2717 4 2888 2718 4 2888 2765 4 2888 2765 4 2888 2817 4 2888 2888 4 2888 2888 4 2888 2901 4 2888 2906 4 2888 2957 4 2888 2959 4 2888 2965 4 2888 3087 4 2888 3154 4 2888 729 4 2888 2046 5 2888 2888 5 2888 2888 5 2888 2888 5 2888 616 5 2888