Abstract
This meta-analysis summarized findings from 65 studies using the hidden profile paradigm (101 independent effects, 3,189 groups). Results showed (a) groups mentioned two standard deviations more pieces of common information than unique information; (b) hidden profile groups were eight times less likely to find the solution than were groups having full information; (c) two measures of information pooling, including the percentage of unique information mentioned out of total available information (the information coverage measure) and the percentage of unique information out of total discussion (the discussion focus measure), were positively related to decision quality, but the effect of information coverage was stronger than that of discussion focus; and communication medium did not affect (d) unique information pooling or (e) group decision quality. Group size, total information load, the proportion of unique information, task demonstrability, and hidden profile strength were found to moderate these effects. Results are discussed in terms of how they offer conceptual advancement for future hidden profile research.
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