[word=□]
[word=models]
Policymakers in the United States might want to consider different models if a centralized administrative agency were to be established to handle CSCR functions , as part of an individual account system . return to top A Common Agenda The effort to involve men in reproductive health programmes is picking up momentum , and useful programme models have been developed . Ioannides studies mathematical models based on controlled random fields , while Tesfatsion works in the context of a particular agent-based model , in which the " agents " are strategies that play Prisoner 's Dilemma with one another . Usually this leads to a rich psychological world in which agents ' ideas or mental models compete for survival against other agents ' ideas or mental models - - a world that is both evolutionary and complex .