OYIS is accredited by the Accrediting Commission for Schools, WASC (Western Association for Schools and Colleges). ACS WASC accreditation is an ongoing cycle of quality whereby schools demonstrate the capacity, commitment, and competence to support high-quality student learning and ongoing school improvement. The ACS WASC Focus on Learning protocol guides schools into an ongoing improvement process that includes implementation, assessment, and refinement of the schoolwide action plan on an annual basis. Appropriate reports and reviews throughout the cycle of accreditation support this process. ACS WASC works closely with the East Asia Regional Council of Schools (EARCOS) in the East Asia region.