The school has been fully accredited by AdvancEd since 1990, previously called Southern Association of Colleges and Schools Council on Accreditation and School Improvement (SACS CASI). Prior, ISA was accredited by the New England Association of Schools and Colleges (the school transferred because SACS CASI more widely represented the region). AdvancEd conducted both an interim visit in April 2011, and a full accreditation visit in 2013, and was awarded full accrediation status for 5 years 2013-2018.
The school is also accredited through the Education Ministry of the Netherlands and received a full 4 year accreditation in September 2012.
Educational advisors from the Stichting Nederlands Onderwijs in het Buitenland (NOB) made a consultation visit February 2011, and continue to be in touch on a regular basis.
Additionally, the school holds a membership in the Association for the Advancement of International Education, is governed by International Schools Services, is assisted by the Office of Overseas Schools of the U.S. Department of State, and is a PTC Member School. (links below).