The U.S. Department of Agriculture's Economic Research Service has developed the Country Projections and Policy Analysis (CPPA) model-builder to assist analysts in generating projections of agricultural market outcomes and conducting long-term policy analyses. CPPA is a spreadsheet based, program driven system that facilitates the specification of price linkages and economic relationships in agricultural markets. The system generates projections of market outcomes from linkages between domestic prices and exogenous reference prices, given exogenous macroeconomic conditions and user-specified endogenous economic relationships. The model-builder can accommodate 46 cross-linked commodity models, including grains, cotton, sugar, oilseeds and products, animal inventories, and meats, milk, and eggs.