This appendix presents SAS programs for the creation of variables related to the respondent's family background, household, marriage/cohabitation, and fertility. Unless otherwise noted, the programs presented are for round 14, the most recent round. In cases where a variable has been discontinued, the program for the final round in which it was created is presented. Except for minor hand edits to account for inconsistencies in the raw data, variable creation code remains generally constant from round to round. However, users who need code for a specific round not included here may contact NLS User Services.