Simulated interaction (SI) involves the acting out of interactions among people or groups who have roles that are likely to lead to conflict. SI is a subset of role playing, as role playing is also used for situations that do not involve interaction. See role playing for the procedure used in SI. SI is well-suited to forecast decisions in conflict situations such as those that might occur in labor-management negotiations, corporate takeover attempts, international relations, and warfare. An unaided expert must try to think through several rounds of interaction in order to make a forecast. In contrast, SI can realistically simulate interactions. SI can be used to forecast the effect of different strategies. For interactions involving role conflict, research has shown that SI provides forecasts that are substantially more accurate than those from game theory and from expert opinions (Green, 2002). To date, most research on SI has used role-players who were recruited without regard for their resemblance to the people in the target situation. It is expected that using role-players who resemble those involved in a target situation would lead to further gains in SI forecast accuracy.