The Program for International Student Assessment Young Adult Follow-up Study (PISA YAFS) was conducted in the United States in 2016 with young adults (age 19) who participated in PISA 2012 when they were in high school (age 15). PISA YAFS was designed to measure the relationship between performance on PISA 2012 and subsequent outcomes (education, employment, etc.) as well as skills. These skills were assessed in an online assessment of literacy, numeracy, and problem-solving skills called Education and Skills Online (ESO). ESO was developed to provide individual-level results linked to the Program for International Assessment of Adult Competencies (PIAAC).