Practitioners who successfully complete the education, experience and examination requirements prescribed by the American Board for Certification in Orthotics and Prosthetics Inc. (ABC), are conferred the titles of Certified Orthotist (CO) and Certified Prosthetist (CP). The title of Certified Prosthetist-Orthotist (CPO) is conferred to practitioners whose responsibility conform to those of both orthotist and prosthetist and who have successfully completed all requirements.