I am not sure how much evidence there is for Extreme Programming. But if it works, I wonder how much its rules can be translated to areas beyond programming. (Or maybe it already exists. Maybe "two minds work better than one" was already know for millenia, only for IT people it remains a surprising and controversial topic.) Could we somehow abstract the coding details away, and call it Extreme Doing?

It's controverisal, and application to other industries more so, but efforts to target some of the low-hanging fruit are underway.