This program models a cocktail party. The party is made up of groups of both men and women. The partygoers have a TOLERANCE that defines how many people of the opposite sex they are comfortable with. If they are in a group that has a higher percentage of people of the opposite sex than their TOLERANCE allows, then they are considered "uncomfortable", and they leave that group to find another group. This action continues until everyone at the party is "comfortable" within their group.
For detailed instructions on using the program, take a look at the info window from the Party model.
Click on one of the pictures to see a quicktime movie of the model: