Larry talks about this in the on page 163 of the original TBL book....I believe it refers to his 1989 paper

Michaelsen, L.K., Watson, W.E., Black, R.H. (1989) A realistic test of individual versus group consensus decision making <http://www.psych.uw.edu.pl/%7Ejasia/michaelsen.pdf> . Journal of Applied Psychology, 74(5), 834-839

jim

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From: Matt Barclay <[log in to unmask]">[log in to unmask]>
Reply-To: Matt Barclay <[log in to unmask]">[log in to unmask]>
Date: Thu, 02 Sep 2010 09:37:30 -0600
To: "[log in to unmask]">[log in to unmask]" <[log in to unmask]">[log in to unmask]>
Subject: evidence for higher gRAT scores

Hi Everyone,

When I was at the TBL conference back in March, I heard a number of people claim that in all of their experience, groups score higher on the gRAT than the highest score of any of the individual group members (on the corresponding/preceding iRAT). I am very interested to know of any sources that document these results. Are there any publications that deal with this or is this something that people have casually noticed as they have gone along? Any formal investigations?

Thank you.
Matt