From the Advance-Ed website:
"AdvancED is the world’s largest education community, serving more than 30,000 public and private schools and districts across the United States and in more than 70 countries that educate over 16 million students..."
"The AdvancED Accreditation Process, a protocol embraced around the world, is a clear and comprehensive program of evaluation and external review, supported by research-based standards, and dedicated to helping schools, districts and education providers continuously improve."