Energy-Economy-Analysis. Linking the Macroeconomic and Systems Engineering ApproachesC.-O.WeneauthorInformal linking or softlinking of macroeconomic and systems engineering models can provide a large variety of tools for joint energy-economy analysis. A necessary condition for internal control of such linking is a common, formalized language describing areas of overlap between the models. The principle of common language is discussed and demonstrated for the softlinking of a macroeconomic model (ETA-MACRO) and a systems engineering model (MESSAGE III).1996RR-96-017. Reprinted from Energy, 21(9):809-824 [1996].Monograph