In this paper we present a research project aiming at the design and development of an Object-Relational Data Warehousing System (ORDAWA). The project is conducted in co-operation of Institute for Informatics-Systems, Klagenfurt University, and Institute of Computing Science, Poznan University of Technology. Important goals of the project are to develop techniques for the integration and consolidation of different external data sources in an object/relational data warehouse, the construction and maintenance of materialized relational as well as object-oriented views, index structures, query transformations and optimizations, and techniques of data mining.

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