This article describes the history and process of credentialing: accre
ditation of programs and certification of individual practitioners. Un
der accreditation, general (institutional) and discipline-specific req
uirements, both for residencies and fellowships, are considered, along
with possible outcomes and the appeals mechanism for an unfavorable r
eview. Under certification, the relationship between individual specia
lty boards and the American Board of Medical Specialties is defined, f
ollowed by a consideration of the principles underlying subspecialty c
ertification and recertification. It is concluded that enforced standa
rds of learning are one of the pillars of accountability upon which a
profession must rest; that if medicine abdicates its responsibility to
impose credible standards on itself, its place will be taken by very
interested, but less knowledgeable, others; and that we must, therefor
e, rededicate ourselves to the requirement of reasonable standards as
a professional obligation and use the best means possible to meet that
responsibility.