APAC has developed a broad set of modeling, data management, and analytical tools to complement our research program. POLYSYS APAC's principal policy modeling framework is POLYSYS, an economic simulation model of the U.S. agriculture sector. This model is capable of incorporating yield and export variability. In addition to major crops and livestock commodities, the model can consider bioenergy crops and environmental performance indicators. TnFARMS Tennessee Financial analysis and Risk Management Strategies (TnFARMS) is a set of models representing farms across the state (grain, cotton, tobacco, and beef cattle farms). The models can be used to estimate the impact of various policies, economic conditions, or management strategies on each farm's profitability and financial strength. APAC Databook and Data Manager Much of the data routinely used in APAC's models is now available to other researchers and policy analysts through the second edition of the APAC Databook. In addition to the printed Databook, the Data Manager software allows you to quickly located, compute, graph, and export critical data. Various data series are available, including APAC and PS&D variables. ABS - APAC Budgeting System The APAC Budgeting System (ABS) is a database-driven farm budget generator providing detailed field operations schedules and associated per-acre crop production costs for a wide range of production systems and soils.