The International Accreditation Service (IAS) is a nonprofit, public-benefit corporation that has been providing accreditation services since 1975. IAS accredits a wide range of companies and organizations including governmental entities, commercial businesses, and professional associations. IAS accreditation programs are based on recognized national and international standards that ensure domestic and/or global acceptance of its accreditations. As one of the leading accreditation bodies in the United States, IAS is a signatory to the four primary international organizations that form a unified system for evaluating and recognizing competent accreditation bodies worldwide. These organizations are IAF, ILAC, APLAC and PAC.