The International Model for Policy Analysis of Agricultural Commodities and Trade (IMPACT) was developed at IFPRI at the beginning of the 1990s to address a lack of long-term vision and consensus among policy-makers and researchers about the actions necessary to feed the world in the future, reduce poverty, and protect the natural resource base. Over time, this economic model has been expanded and improved and IMPACT is now a network of linked economic, water, and crop models. IMPACT integrates information from climate models (general circulation models, or GCMs), crop simulation models (e.g. DSSAT), and water models in a consistent equilibrium framework that supports longer-term scenario analysis. Some of the model communication is one-way, with no feedback links (e.g., GCM scenarios to hydrology models to crop models), while other links require capturing feedback loops (e.g., water demand from the economic model and water supply from the water models must be reconciled to estimate water stress impacts on crop yields). The IMPACT model simulates the operation of national and international markets, solving for production, demand, and prices that equate supply and demand across the globe. This flexible framework of models supports integrated analysis of the implication of physical, biophysical, and socioeconomic trends and phenomena, allowing for varied and in depth analysis on a variety of key issues of interest to policy makers. As a flexible policy analysis tool, IMPACT has been used to research linkages between agriculture production and food security at the national[1]  and regional[2]  level. IMPACT has also been used in commodity-level[3]  analyses, and has contributed to thematic and interdisciplinary scenario-based projects[4].

In addition to the model itself, and work coming out of the model, IFPRI has focused significant efforts in developing a community of IMPACT users inside and outside of IFPRI. In these efforts, IFPRI has developed a series of training workshops to teach policy makers and researchers about scenario analysis and the use of IMPACT. These training workshops have been led by members of the IMPACT team, and have been hosted all over the world including training workshops in the last couple of years in Russia, Malaysia, Colombia, and Washington, DC.

[1] Africa Agriculture and Climate Change Research Monographs: Waithaka et al. 2013; Hachigonta et al. 2013; Jalloh et al. 2013, (2) a variety of country reports such as Tackle et al. 2013 , and Nelson et al. 2013.
[2] Examples of Regional analyses: (1) Food security issues in the Arab region (Sulser et al. 2011); (2) the discussion paper “Assuring Food and Nutrition Security in Africa by 2020” (Rosegrant et al. 2005), and Irrigation technologies in OECD countries (Ignaciuk and Mason-D’Croz, 2015).
[3] Examples of Commodity Analyses: (1) Alternative Futures for World Cereal and Meat Consumption (Rosegrant et al. 1999); (2) the article Global Projections for Root and Tuber Crops to the Year 2020 (Scott et al. 2000); (3)  Livestock to 2020: The next food revolution (Delgado et al. 1999).
[4] There are many examples of thematic and interdisciplinary projects such as: (1) IFPRI-IWMI book World Water and Food to 2025: Dealing with Scarcity (Rosegrant et al. 2002); (2) Food security and climate change (Nelson et al. 2010); (3) the CGIAR’s Strategic Results Framework (SRF 2009), and  the Agriculture Model Intercomparison and Improvement Project (Nelson et el 2014).