International Accreditation Central Services (IACCS) International Accreditation Central Services (IACCS) is a certification verification system established by experienced educators and engineers. IACCS audits and approves the trainings organized by training centers, universities, institutes and high schools, the quality and content of the trainings and the qualifications of the trainers who provide these trainings. Education centers approved by IACCS are entitled to issue an IACCS-approved document to their students/trainees. IACCS is a non-profit, public benefit corporation that provides accreditation services.