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- Supply-demand matrix: a process-oriented approach for data warehouses with constellation schemasPublication . Cavique, Luís; Cavique, Mariana; Santos, Jorge M. A.Star schema in data warehouses is a very well-established model. However, the increasing number of star schemas creating large constellations schemas add new challenges in the organizations. In this document, we intend to make a contribution in the technical architecture of data warehouses with constellation schemas using an extension of the bus matrix. The proposed supply-demand matrix details the raw data from the original databases, describes the constellation schemas with different dimensions and establishes the information demand requirements.