The following is the introduction to a post that appears on the National Center for Education Statistics Blog
Categories of educational attainment – or highest degree earned – are often used in social science research as an indicator of a person’s knowledge and skills. This measure is objective and readily available, easily understood by survey respondents as well as by consumers of research and survey data, strongly tied to policies (such as those promoting high school graduation and college completion rates), and widely used in the labor market by employers. Moreover, strong connections between educational attainment and positive life outcomes, such as employment, earnings, health, and civic engagement, are well established.
The article compares the direct measures of cognitive skills with the highest level of educational attainment as reported in the 2012 Program for the International Assessment of Adult Competencies (PIAAC) survey. You can read the full story on the National Center for Education Statistics Blog.