These workshops will consist of a two-part group modeling activity examining the vulnerabilities of urban food systems. While the workshops will build on one another, they can also be experienced independently. Participants do not have to attend both, but may. The workshops have two purposes. First, they will demonstrate how a group model building approach works in a food systems context. Second, they will provide a forum for structured discussion about the urban food system issues that are presented at the conference and elicit the expertise of all participants, including those who are not presenters. We expect that the workshop exercises will add value to the conference presentations and lead to participant collaborations beyond the conference. Tentative agendas for the two workshops are given below, but may be adjusted to accommodate the time available and specific participant interests.