Procedures are outlined for estimating changes in parenthood and marital status for respondents of the National Longitudinal Study of the High School Class of 1972 (NLS). Seven key variables that summarize the information on parenthood and marital status are estimated: number of children as of the first week of October in 1973, 1974, and 1976, a composite estimate of the date of first marriage; and marital status as of the first week of October in 1973, 1974, and 1976. To facilitate the adoption of procedures by other users, a FORTRAN subroutine that creates these variables is provided. The documentation accompanying the subroutine gives the technical details of the procedures outlined. (Author/GK)