[Jdanz]

yes groups are different, history has shown time and again that race isn't the reason why group succeed or fail. So if race isn't the causal mechanism, but this group has underachieved, what are we talking about?

Obviously this under acheivement can be viewed in many ways, oen as essentially unpredictable, a la MMMMMMM, two as a result of the group's inherent qualities, or three as a result of actions outside of the groups control.

The results can be either random, endogenous, exogenous, or some combination thereof. ALL the evidence points towards door number three as the most likely and most important of the possible explinations.