This concluding chapter proposes generalizations that emerge from theory and research on group problem solving and a brief retrospective and prospective. Group tasks are ordered on a continuum anchored by intellective and judgmental tasks. Intellective tasks have a demonstrably correct solution within a mathematical, logical, scientific, or verbal conceptual system. Judgmental tasks are evaluative, behavioral, or aesthetic judgments for which no generally accepted demonstrably correct answer exists. The underlying basis of the intellective-judgmental continuum is a continuum of demonstrability. The proportion of group members that is necessary and sufficient for a group response is inversely proportional to the demonstrability of the proposed response.
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