The Association of Christian Schools International (ACSI) is the largest Protestant educational organization in the world. Since 1978, the ACSI has advanced excellence in Christian schools by providing support functions for teachers and administrators. 

Those functions include a host of services, including teacher and administrator certification, school accreditation, legal/legislative help, professional and personal development for Christian educators, and textbook publishing.

ACSI member schools serve more than 5.5 million students worldwide with 25 offices around the globe. Nearly 24,000 schools from over 100 countries are members of this organization, with 3,300 US-based schools obtaining primary funding. 

Learn more about ACSI by visiting their site acsi.org.