1. A system for creating queries on model data of at least one data source in accordance with at least one data source specific format, wherein the system comprises: processing resources including at least one processor and a memory; a graphical query builder configured to enable a user to graphically define a query comprising a plurality of building blocks in accordance with a data source independent format; and at least one adapter for the at least one data source configured to translate the query in the data source independent format into at least one corresponding query in the data source specific format.