A "world model" is constructed where precedent searching is one of the primary driving mechanisms. The simulation assumes that nations in the system are utility maximizers but that they have relatively primitive decision mechanisms and are strongly influenced by their previous short-term successes and those of other states in the system. This model of foreign-policy decision making has been heavily influenced by recent artificial intelligence studies and simulations. States in the simulation can follow one of three distinct strategies to maximize growth: imperialism, militarism, or trade. In each of these modes, a state can either increase or decrease its level of behavior, or it can switch modes. Decisions to switch are based on the success of the policy in increasing simulated GNP relative to earlier pro jections of how much GNP would increase. If a policy is clearly not working, a nation implements the reverse of it, if the policy is not producing major improvements, the nation randomly experiments or looks at the success of other nations in the system and follows whatever has worked for them. If a policy is clearly successful, it is continued.
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