Lu, L., Yuan, Y. C. and McLeod, P. L. (2012). Twenty-five years of hidden profiles in group decision making: A meta-analysis. Personality and Social Psychology Review, 16(1), 54–75. doi:10.1177/1088868311417243.
Not read. The summary is drawn from the abstract or from what the work is standardly cited for. A reading should check it first.
Why this is here
The exchange cited it for CASE-108 and QUESTION-089: 65 studies, 3,189 groups, hidden-profile groups eight times less likely to find the correct solution. The abstract agrees on all three figures. It adds that the number is relative to groups with full information, and that information coverage, not discussion focus, predicts quality best, which bears on QUESTION-089’s dissenting process: unique information helps when it is pooled, not merely voiced.