Documentation for use with data collected through the National Longitudinal Study of the High School Class of 1972. Data sets with which this manual is used include base-year (1972) survey data, collected by the Educational Testing Service, integrated with first follow-up (1973-1974), second follow-up (1974-1975), third follow-up (1976-1977) and fourth follow-up (1979-1980) survey data, collected by the Research Triangle Institute.