Collective intelligence

Notes:

Hive mind, The Borg, mob mentality, regression to the mean, collaborative policy and decision-making, knowledge management...

Basic question: What determines whether collective intelligence becomes better able to handle diverse problems, versus regressing to the mean? Same question as why large companies can become "dinosaurs" and loose their nimbleness. Optimum size for a creative working group. An effective interplay of diversity, specialization, common goals/benefits, management.