Post-high school activities of 1983 California graduates were studied as part of the initial phase of a 5-year follow-up study. Of 11,512 graduates who were mailed a questionnaire, 4,040 responded. About 75 percent indicated that they were enrolled in a school or college during the last fall or winter; about 49 percent were employed and about 16 percent were unemployed. Only a small proportion were involved in other activities, such as military service (3.3 percent in the fall and 2.3 percent in winter), job-training programs (2.9 and 2.5 percent, respectively), or such activities as travel, missionary or church-related service, and homemaking (3.5 percent). Of those respondents who were working, 62 percent were also attending school or college. In general, women were more likely to report involvement in several activities, while men were more likely to identify a single activity. The proportions of black respondents participating in postsecondary education was the lowest among five ethnic groups (67.8 percent), while 91 percent of Asian respondents reported attending school. A substantially larger than average proportion of men than women attended out-of-state postsecondary institutions. Information on characteristics of the graduating class and the survey respondents is also provided. The questionnaire is included. (SW)