In an article I was reading about Da Vinci Science and Design schools in Hawthorne, California a couple of stats regarding the effectiveness of PBL learning were given:
"A 1999 University of Memphis study found that Tennessee schools that used PBL outperformed schools using traditional teaching methods by 26 percent. A similar study showed New Jersey PBL students scoring 27 percentage points higher on statewide tests than their traditional counterparts."
I wonder how much the budget must increase for such schools to realize those results. It appeared that the Da Vinci schools were getting a good share of industry support.
From just looking at those two studies it would appear all schools must move in this direction.