The 2014 PIAAC U.S. Prison Study Public Use File (PUF) contains individual unit record data including responses to both the background questionnaire and the cognitive assessment from the data collection completed in 2014. Statistical disclosure control treatments were applied due to confidentiality concerns. For more details on the Prison Study PUF, please refer to Appendix E of the U.S. PIAAC Technical Report 2012/2014 (NCES 2016-036REV).