The Program for International Student Assessment Young Adult Follow-up Study (PISA YAFS) is a follow-up study with students who participated in PISA 2012 in the United States. The study is designed to measure how performance on PISA 2012 relates to subsequent measures of outcomes and skills of young adults on an online assessment, Education and Skills Online (ESO). PISA is administered in the United States every 3 years, and is intended to measure the mathematics, science, and reading literacy skills of students who are approaching the end of compulsory schooling, at approximately age 15 when the majority of these students are in the 10th grade. The second set of data needed for the PISA YAFS study was conducted in 2016, approximately 3.5 years after PISA 2012. This technical report provides information related to the PISA YAFS data collection with a focus on what it purports to measure, data processing and weighting, linking to U.S. PISA 2012 data, and how to use the data files. This document is organized into eight sections with appendixes, exhibits, and tables listed in the table of contents. [For the full report, "2012-2016 Program for International Student Assessment Young Adult Follow-Up Study (PISA YAFS): How Reading and Mathematics Performance at Age 15 Relate to Literacy and Numeracy Skills and Education, Workforce, and Life Outcomes at Age 19. Research and Development Report," see ED613367.]