The complex phenomenon of intraindividual and interindividual differences in the development of occupational aspirations and factors influencing this development were examined in a longitudinal sample of 5,727 Korean adolescents over a 4-year period. A downward trajectory of occupational aspirations from junior high school to the first year of high school was found. Rate of change in expressed aspirations was different for men and women. Potentially important initial differences in occupational aspirations development, based on curriculum track, were also detected.