True integration, however, would not be possible until the arrival of the relational database model. This flexible database approach permits the design of integrated systems applications capable of support- ing the information needs of multiple users from a common set of integrated database tables. We should note, however, that the relational database model merely permits integration to occur; integration is not guaranteed. Poor systems design can occur under any model. In fact, most organizations today that employ a relational database run applications that are traditional in design and do not make full use of relational technology. The two remaining models to be discussed (REA and ERP) employ relational data- base technology more effectively.