The Private School Universe Survey (PSS) is a program of the U.S. Department of Education’s National Center for Education Statistics that collects selected data about all private schools every two years. Data are supplied through a survey that is compiled by administrative personnel in private schools. The NCES definition of a private school is “A private school is not supported primarily by public funds, provides classroom instruction for one or more of grades K-12 or comparable ungraded levels, and has one or more teachers. Organizations or institutions that provide support for home schooling without offering classroom instruction for students are not included.”