graduates of the Hubbard CertifiedAuditor Course. At one time this was the course which an auditor did to attain professional certification in Central Organizations, except in Great Britain. Its equivalent in Great Britain was called the Hubbard Professional Auditor Course. HCA, as a title, now refers to Class II Auditors. See also HPAs in this glossary.—FutureOrg Trends Approved 4.3.91