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This paper presents a preliminary report on a relational database management system called PRECI/C which was developed at Aberdeen University as part of the PRECI project. The aims of PRECI/C were to provide a test harness for future database research and to test the effects of applying ideas in software engineering to the design and implementation of a database management system. It is founded on the concepts of a layered system architecture and a virtual database, and has been implemented in 'C' on a DEC PDP11 under Unix. The implemented system is currently being used for both research and undergraduate teaching. This paper presents an overview of the system architecture, design and implementation of PRECI/C to date. We highlight the main features of the system and discuss possible extensions.