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Four-person groups responded to a four-choice sequential decision task for three blocks of trials. Decision patterns were analyzed in terms of strategies (a plan for distributing choices across a 50-triaI block) and social decision schemes (majority, plurality, equiprobability, and highest expected value) for selecting among member strategy proposals. Predictive models, assuming each decision scheme in turn and using parameter estimates from an independent sample of individuals, were compared with group data on each block. By the third trial block, all of the social process models considered, except equiprobability, could be rejected as inaccurate. Such a finding, though consistent with other research and informal interaction data from this study, was unanticipated for a sequential response task.

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