This report presents data obtained from Project Talent (a longitudinal study designed to achieve a better understanding of the career plans and career development of young adults). In 1960 400,000 students in grades nine through twelve were administered a battery of specially constructed tests and inventories which collected data about their future plans, family background, interests, aptitudes and abilities. A series of follow-up studies has been completed or is being planned for one, five, ten and twenty years after each of the classes graduates from high school. The sample used in this study consisted of more than 69,000 students who responded to a five year follow-up survey. A summary of the data indicates that there was a high incidence of students' changing their career plans during the first five years after graduation. Whether or not plans were changed was found to be only slightly influenced by the amount of thought the student had given to his future career and the certainty and time of the initial choice. The changes seemed to have been made on a rational basis since they were in the direction of a more adequate utilization of the students aptitudes and abilities. (RSM)