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Brilliant. One for Bob Sutton's collection I reckon.
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Keith Sawyer has argued the brainstorming is ineffective. "But most of what groups are asked to do in the real world is a lot different than simply generating lists of ideas. There are many studies showing that on more complex tasks involving knowledge of conceptual systems groups perform better than individuals."

The power of rehearsal
Reflections on the power of rehearsal, from a master performer