On April 22, 1988, the first Certifying Examination in Geriatric Medicine was administered jointly by the American Board of Internal Medicine and the American Board of Family Practice to 4,282 diplomates (ABIM = 2,202; ABFP = 2,080). This paper addresses both an analysis of the examination and the relationship between performance on that examination and a group of characteristics of the examinees, collected as part of the registration process. The pass rate was 56%. Performance on the examination was positively correlated with scores on the general certifying examinations and with training in geriatric medicine. Data provided by the candidates in an addendum to the application were also available for analysis and were used to derive correlations with groups of questions. The performance of candidates was positively correlated with seeing large numbers of elderly in hospitals, nursing homes, or home settings, working in a University Hospital, teaching and research, and the size of the community in which the candidate practiced. Physicians from long-term care settings did exceptionally well. Working in a solo practice setting was negatively correlated with performance on the examination as was working in a for-profit setting.