The 2003 NSCG is the baseline survey for the decade of the 2000s. Approximately 177,320 people were initially selected for the 2003 NSCG new cohort sample from those cases that had completed the 2000 decennial census long form and indicated that they had received at least a bachelor's degree in addition to other sampling criteria. The final 2003 NSCG new cohort sample size was 170,797 cases after some adjustments were made to the sampling frame. An additional 40,073 cases were selected for the 2003 NSCG old cohort sample from respondents to the 1999 NSCG (originally from either the 1993 NSCG or the 1993-1997 NSRCG), the 1999 NSRCG, or the 2001 NSRCG. Follow-up surveys are conducted every two or three years and include only individuals identified in the 2003 NSCG new cohort survey as having an S&E degree and/or an S&E occupation who responded in the prior survey year and who met other eligibility criteria (e.g., age criteria). During the follow-up years, a small sample of respondents to the 2001 and later NSRCGs was also surveyed as part of the NSCG. The survey sample size for the 2008 NSCG was the same as for the 2006 NSCG (68,000 cases).
In 2010, the Census discontinued the use of the long form, so the American Community Survey (ACS) was used as a sampling frame for the 2010 NSCG and 2013 NSCG. Additionally, the surveys now include individuals identified as having received at least a bachelor's degree in any field.