Abstract
Friedkin and Johnsen's interpersonal influence model (Friedkin, 1999; Friedkin and Johnsen, 1999) does not specify the mechanism of social influence, how they affect each other. I introduce some social psychological theories and bring those into Friedkin's model so that the emergence of social influence through the social psychological process is clearly described. At the same time, the possibility of reactance against the persuasion is introduced. Reactance plays a role for the people in the group to have similar but not identical attitudes.