The goal of this demonstration is to present MDBE, a tool implementing our methodology for automatically deriving multidimensional schemas from relational sources, bearing in mind the end-user requirements. Our approach starts gathering the end-user information requirements that will be mapped over the data sources as SQL queries. Based on the constraints that a query must preserve to make multidimensional sense, MDBE automatically derives multidimensional schemas which agree with both the input requirements and the data sources.