Introduction: This document contains a series of briefing sheets on current modeling activity in ESS. It was compiled for an administrative briefing on this topic. The breath of modeling activity ongoing within ESS was felt to be of sufficiently broad interest to warrant publication of the briefing sheets. The larger comprehensive models are presented first under the heading of Integrated Agricultural Sector Models. A set of Macroeconomic and Other Nonagricultural Models are described next. Finally a variety of more narrowly focused domestic and international agricultural sector and related models are reviewed. The briefing sheets are arranged in alphabetical order by model name within each major section. The sheets present a synopsis of each model (description, applications, and costs) and indicate the appropriate contact person with organizational affiliation and phone number.