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Having downloaded NetLogo and played around with it for a while, I am unsure whether it will meet the needs of our modeling project.

• NetLogo is particularly aimed at modeling systems as they adapt over time. Agents in NetLogo continuously respond to each other's decisions, resulting in an ever-changing environment. To a great extent, we are interested in modeling a system that will develop over time: at a farmers' market, for example, a seller makes a decision (setting up a vendor station), a buyer makes a decision motivated by the seller's decision (walking over to the vendor station), then another decision (whether or not to buy from the this particular vendor), etc. For these types of interactions, it is crucial to have a simulation program that effectively displays change over time in the system, showing how decisions by each agent impacts each following decision by other agents.

For those who are unfamiliar with agent-based modeling (ABM), here is an easy-to-understand introduction to the subject. It is a list of answers to frequently asked questions about ABM, entitled "Agent-based modeling of complex, adaptive systems." It explains how agent-based modeling allows these systems to be modeled, and why modeling is a useful tool for understanding these systems.