Enrollment in traditional teacher preparation fell from about 880,000 in 2010-11 to about 591,000 a decade later, and roughly one in eight teaching positions is now unfilled or held by someone not fully certified. The episode covers the ed-school critique, Teach For America, alternative routes, and the scramble of residencies and apprenticeships, noting that shortages are real but specific to subject and place.
Whether a national teacher shortage exists is argued; evidence points to real but localized shortages, while advocates stress positions filled by uncertified teachers. Evidence on which preparation route works best is mixed, and apprenticeships have little rigorous outcome data.