The National Longitudinal Survey of Youth 1979 (NLSY79) is a nationally representative sample of men and women who were born in the years 1957 to 1964 and living in the United States when the survey began in 1979. The sample members were ages 14 to 22 during the first round of data collection. A primary focus of the NLSY79 is labor force behavior, but the content of the survey is considerably broader. The NLSY79 includes questions on educational attainment, training, income and assets, participation in government programs, health, workplace injuries, insurance coverage, alcohol and drug use, sexual activity, marital and fertility histories, and other topics. The NLSY79 was conducted annually from 1979 through 1994 and has been conducted biennially since 1994. The original sample included supplemental samples ofblacks, Hispanics, economically disadvantaged nonblack/non-Hispanics, and youths in the military. The military supplemental sample was discontinued after the 1984 survey, and the economically disadvantaged nonblack/non-Hispanic supplemental sample was discontinued after the 1990 survey. Since 1986, Bureau of Labor Statistics (BLS) also has conducted a study of all children born to female NLSY79 respondents. The survey is called the NLSY79 Child and Young Adult survey (NLSY79 CYA) and has been sponsored by the National Institute of Child Health and Human Development (NICHD). In concert with the NLSY79 CYA, NICHD also sponsors several questions within the main NLSY79 survey dealing with children and fertility issues. Round 27 of the NLSY79 CYA will interview children ages 12 to 22 and include many questions modeled on the NLSY79 questionnaire focusing on employment,