Collective decision making - To interact or not

Another take on collective sense making/decision making I've been thinking about is the difference between methods that do or don't use interaction in the process. Open Space Technology and Cynefin methods for example use group deliberative processes where people engage with each other to make decisions. Even conventional facilitated consensus approaches to strategy
require that people have to engage with each other in some way to come up with a collective decision. James Surowiecki in The Wisdom of Crowds suggests however that some highly effective predictive decisions can be taken by the aggregation of individuals' decisions with little or no interaction in the process. For example he cites the case where participants in the stock market collectively determined which of the potential four companies was responsible for the defect that caused the Colombia space shuttle disaster, a full six months before the official investigation concluded the same. It'll be interesting to see how methods emerge for using this type of 'aggregated, non-interactive' mass decision making in organisations.