The other thing that has changed—and this is huge—is that technology has radically lowered the expenses formerly associated with mastery learning. No more paper workbooks. No more pricey printings of individualized exercises. Everything needed for self-paced learning is right there in the computer; the cost of delivering it to students is miniscule. The old excuse that newfangled teaching methods are just too expensive—or are only the province of elite schools in privileged communities—just no longer applies.
