If you are referring to underemployment...
https://www.newyorkfed.org/research/college-labor-market#--:...
What is your definition of underemployment?
The definition of underemployment is based on the kinds of jobs held by college graduates. A college graduate working in a job that typically does not require a college degree is considered underemployed. This analysis uses survey data from the U.S. Department of Labor’s Occupational Information Network (O*NET) Education and Training Questionnaire to help determine whether a bachelor’s degree is required to perform a job. The articles cited above describe the approach in detail.