[ora600]

Follow up research I'd like to see:

Some research has been done on effective group problem solving. There are several possible methods - pick a leader and let him decide, reach consensus, majority decision, etc. Some have been shown to be more effective than the rest.

Teach an effective method to all groups, and see if there is still any difference.

[ZoFreX]

Surely this study has already been done? It seems like an obvious one to do.