A chronological development of computerized data management technology is presented that is based on advances in computer hardware and software technology. In may opinion, the development can be classified, based on the techniques employed, into four generations (which differ from the four generations of electronic computers). Some basic and derived data organization techniques are reviewed and compared. The first three generations (the pre-data base technique period) are summarized in order to provide continuity. Special attention is given to the fourth generation, in which Data Base Management System (DBMS) is a major component. Three DBMS models - hierarchical, network and relational are described in general terms. Characteristics of each model are cited and some commercially available DBMSs are reported. Finally, a note about the anticipated future of computerized data management technology is given.
