![]() At each time interval, agents examine their own state and their neighbors’ states, and then determine their next state. In this model, two-state agents (0 or 1) are arranged around in a circle.You can adjust the forest layout, tree density, growth rate, and fire rate to see the trees go from individual entities to an interconnected unit.This simple model can provide some provocative results with respect to productivity and growth. When trees get hit, forest fires start and burn down neighboring trees. In this model, trees grow in the forest, but during the lightning season, some trees get struck down.This model explains how microlevel rules, can lead to global patterns in both space and time.When exposed to positive feedback, however, changes are amplified and lead to instability. ![]() Negative feedback is quickly absorbed and the system reaches stability. If a system is subject to interactions with outside influences, the feedback my have an effect on the system.You can adjust the number of cities and citizens in this clear introduction to Tiebout’s concept of “voting with your feet.”.It illustrates how, given majority rule and mobility, citizens with different preferences can all enjoy their favorite chili. The model assumes two towns, each with three citizens, and the towns are facing a difficult choice over an important public good: whether to serve green or red chili at their annual picnic. Preferences and mobility are the name of the game for this model.This model illustrates how a hive with a diverse set of thresholds may be activated to respond to a threat more easily than one in which all the bees exhibit similar thresholds.Each bee, however, has a particular threshold, or the amount of pheromones that must be produced to illicit a response. To announce the presence of a threat, a bee will release chemical pheromones that recruit other bees in the hive. You can adjust the number of bees, hive insulation, cooling and heating power to see the bees adjust the hive temperature.This model explains how a group of bees with a diverse set of temperature sensitivities maintain a more stable environment than a group of more similar bees would. They do so by huddling together to increase the temperature, or spreading out to decrease it. Bees must maintain their hive temperature within a fairly small threshold.You can adjust the performance quality, seat location, group size, and more to see the influence they have on provoking a standing ovation.Although standing ovations seem to arise spontaneously, this simple model examines mathematically how a standing ovation can spread throughout a crowd.Here is a list of the agent-based models described in Complex Adaptive Systems using NetLogo, these systems becoming interactive and fun! After installing NetLogo, click on one of the models below to view the systems.
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