Input-output modeling activities have been sponsored by IIASA for many years. These activities provided a link between various research centers as well as associated research groups engaged in constructing similar systems, and also individual researchers interested in the application of input-output type models. The aim of the sixth IIASA meeting was to demonstrate to a wide community of researchers, policy makers and their advisers the likely uses of integrated input-output models in econmic policy both at industrial and national levels. This message is well illustrated. The papers provide the users with illuminating simulation studies showing on the one hand the impact of technological structural changes in the macroaggregates and on the other hand how the changes in macrovariables influence the pattern of changes in particular industries. This volume presents the results of the meeting organized by IIASA and IES in Warsaw. WLADISLAW WELFE Director Institute of Econometrics and Statistics University of Lodz CONTENTS 1 Introduction '1 Iouri Tchijov and Lucja Tomaszewicz Principles and Practices of the INFORUM 7 Interindustry Macro Model Clopper Almon The Use of Impact Tables in Policy Applications 27 of Input-Output Models PaaZ. Sand On Policy Applications of Input-Output Models 45 in the Federal Republic of Germany Renate FiLip-KBhn and Reiner St~glin Technological Progress Analysis: 59 Some Input-Output Approaches Iouri Tchijov and Irene Sytchova 67 Inforum-Type Model for Czechoslovakia Pavo l Karasz An Easy Econometric Way of Constructing 79 Input-Output Tables J. F. Divay and F.