To earn accreditation from NACEP, concurrent enrollment programs conduct a self-study, document how their programs adhere to NACEP's seventeen standards, and are evaluated by peer reviewers from NACEP-accredited programs. Currently 89 programs nationwide accredited by NACEP: http://nacep.org/docs/accreditation/NACEPAccreditedPrograms.pdf
National Center for Education Statistics (NCES) in U.S. DoE report on 2010-11 school year - estimated increase to 82% of all high schools offering college credit opportunities - most of which (77%) are offered on their high school campus in a "career center." A companion report on postsecondary providers of dual enrollment courses will be released in March. Full report available at http://nces.ed.gov/pubs2013/2013001.pdf