Of the currently available literature on assessment of physician compe
tency, very little applies to the needs of preventive medicine special
ists. Yet the diversity of the field and the confusion among other med
ical specialists about the particular expertise of preventive medicine
physicians suggest a need for consensus on fundamental competencies e
xpected of graduates of preventive medicine residency training program
s. We apply theoretical material on competency-based education from te
acher training and instructional development to professional training
in preventive medicine. We describe the process by which the Graduate
Medical Education Subcommittee of the American College of Preventive M
edicine (ACPM), a working group of specialists, derived and refined co
re competencies in working sessions at professional meetings. The draf
ts produced at these sessions were circulated widely to residency dire
ctors and other individuals and groups in preventive medicine before b
eing approved by the ACPM Board of Regents and included in the Residen
cy Training Manual distributed by ACPM. This article includes this lis
t of core competencies for preventive medicine residents. In addition,
the article describes assumptions about competency development that g
uided the process and identifies recurrent problems in competency deve
lopment. This information may be helpful to readers who wish to develo
p additional competencies or to tailor these competencies for their ow
n preventive medicine residency programs.