Mathematical models Congresses 192 Economics 127 Data processing 119 Economic conditions 114 Economic policy 107 Decision-making 105 Industrial management 82 Economic development 77 Economic aspects 54 Operations research 53 City planning 49 Transportation 48 Management 45 Pollution 45 Decision making 44 Regional planning 43 Prices 42 System analysis 38 Econometrics 37 Finance 36 Air 35 Macroeconomics 34 Social sciences 34 Economic forecasting 32 Labor supply 32 Marketing 31 Mathematics 30 Atmospheric circulation 26 Consumption (Economics) 26