Group decision making and social influence: A social interaction sequence model.

Stasser, G., & Davis, J. H. (1981). Group decision making and social influence: A social interaction sequence model. Psychological Review, 88, 523-551.

Discusses the social interaction sequence (SIS) model, which represents the group decision-making process in terms of the sequential choice behavior—changes in preference and certainty—of group members. This model states that the probabilities of preference and certainty changes are related to the current distribution of opinion in the group. An application of the SIS model to a study of jury decision making (G. Strasser, 1977) is presented, and results of earlier empirical studies are predicted by a computer simulation version of the model. Shift and opinion change versions of the model are proposed, with both extensions incorporating the concept of a characteristic certainty distribution. Characteristic certainty distributions are used to examine the expected effects of group size and assigned-decision rule on members’ confidence in a group’s decision.

Verdict preference shifts best predicted by “norm” model in which juror verdict certainty was a function of information exchange but juror verdict change was a function of normative pressure.

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