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Although Data Warehousing is regarded as a mature technology now, the definition of a federated architecture for Data Warehouse (DW) integration remains an open research question. This paper identifies requirements on a Federated DW System and proposes an architecture supporting the tightly coupled integration of heterogeneous data marts into a global, logical schema. In order to enable the processing of queries in the federation, our approach provides a Dimension Algebra (DA) and Fact Algebradoi:10.1109/hicss.2008.178 dblp:conf/hicss/BergerS08 fatcat:eod37jdtbzgyrkvneug4glfvqy