This proposal requests support for the extension of the Longitudinal Study of American Youth (LSAY) to investigate the development of informal science resource use by young adults in their early to middle 30?s. The LSAY has been funded by the NSF since 1986 and is the largest and longest longitudinal study of the development of young adult interest and competence in science, mathematics, and technology. The LSAY was launched in the fall of 1987 with two national cohorts of 7th and 10th grade students enrolled in public schools in 30 states and continues today. During the years in which LSAY students were enrolled in middle school and high school, extensive data was collected concerning science and mathematics course enrollment, content, and achievement. A broad array of data was collected from each student, parent, and science and mathematics teacher during a seven year period concerning educational plans and career choices. The most recent cycle of data collection in 2007 focused on completing the educational and occupational record of each LSAY participant.