AdvancED is the largest body of education professionals in the world. It is a non-profit organization that conducts rigorous, on-site internal and external reviews of Pre-K-12 schools and school systems to ensure that all learners realize their full potential. More than a hundred years of work in school accreditation, AdvancED is far from a typical accrediting agency. goal isn’t to certify that schools are good enough.Commitment is to help schools improve.
Combining the knowledge and expertise of a research institute, the skills of a management consulting firm and the passion of a grassroots movement for educational change, They serve as a trusted partner to 34,000 schools and school systems—employing more than four million educators and enrolling more than 20 million students—across the United States and 70 other nations. AdvancED was created through a 2006 merger of the Pre-K-12 divisions of the North Central Association Commission on Accreditation and School Improvement (NCA CASI) and the Southern Association of Colleges and Schools Council on Accreditation and School Improvement (SACS CASI)—and expanded through the addition of the Northwest Accreditation Commission (NWAC) in 2011.
Reference :- http://www.advanc-ed.org