Abstract : This report will present the results of a study to determine the most promising mini-computer processor using current hardware technology for implementing the Integrated Database Management System (IDMS) and ultimately leading to a commercially viable back-end database management system. The intent of this study has been to determine the requirements of a back-end processor including both hardware and software and to analyze a variety of commercially available mini-computers to see how they meet these requirements. Certain data collected from hardware manufacturers concerning both their hardware and their software is documented in this study together with a comparison of their products. It must be noted that this study is the result of a mutual interest in back-end database management systems by Cullinane Corporation and various government agencies and reflects a desire on the part of Cullinane Corporation and others to investigate the technical and economic feasibility of back-end database management systems.