The Initiative for Innovation in Pediatric Education (IIPE) 1 is the next phase in a comprehensive reevaluation of pediatric residency education that began with the Residency Review and Redesign in Pediatrics (R 3 P) project. 2 As the IIPE begins, it is worth reflecting on questions that arose repeatedly during the R 3 P project: Just what role does residency play in child health? Does it make a difference where one trains? Can residency improve later adherence to clinical guidelines? and Can residency modify the frequently steep learning curve of subsequent practice?What difference can 3 years of residency make in 40 or more years of pediatric learning? This question is in the same category as whether it matters where one goes to medical school. The answer is elusive, but the imagined answer determines the structure and conduct of residency education. One extreme is that 3 years cannot possibly count for much. The other is that residency is all-important, and an attempt should be made to prepare everyone for everything. That ambitious goal governs our current approach to residency education. 3 The goal was appropriate when virtually every pediatrician's practice was similarly broad. However, pediatric health care is increasingly dichotomized into low-acuity disorders treated exclusively in ambulatory settings, away from academic health centers (AHCs), and complex illnesses treated mostly within AHCs. 4 Career choices follow epidemiology. Only 29% of third-year residents who intend to practice general pediatrics, just 13% of all third-year residents, plan to practice general pediatrics in both ambulatory and hospital settings. 5 This is a different situation from the one for which residency education was intended.What are the consequences of continuing the current approach? The traditional solution to growth in knowledge has been to grow the residency curriculum accordingly. Given the number of subspecialty bins into which knowledge falls, that means a number of disjointed month-long learning experiences with scant opportunity for the deliberate practice needed to develop competence and self-confidence. 6 Moreover, breadth of experience tends to be defined in terms of just 1 of the 2 halves of the care/career choice dichotomy: the AHC. As such, the curriculum is both enriched and constrained.The common impression that the kaleidoscopic structure of current residencies is mandated by regulation is mistaken. Although residency accreditation requirements are comprehensive, 3 they permit discretion in the use of up to 16 of 33 total months. Discretionary months are often used for additional months of inpatient, emergency, and/or acute care experiences defined by the need for hospital service; subspecialties that could be selected by residents are also assigned according to service needs, this time defined more by faculty. The concept of the broadest possible experience inadvertently legitimizes almost any request for resident involvement. It is not surprising that residents have indicated that they would prefer lea...