Abstract.  Hierarchical modeling allows the aggregation of simple subsystem models into more complex models. It is argued that the combination of hierarchical modeling and dimensional analysis yields a technique that allows the ag-gregation of submodels without prior assumptions about the connections of the submodels. The method of dimensional analysis is therefore briefly described and then the hierarchical modeling procedure using dimensional analysis is dis-cussed. The example of an gas turbine is used to illustrate the technique of hierarchical modeling using dimensional analysis.