TWENTY-SEVEN FULL TIME OCCUPATIONS INVOLVING DIAGNOSIS, CARE, AND REHABILITATION OF THE MENTALLY RETARDED ARE DISCUSSED. FOR EACH, AN OCCUPATIONAL DEFINITION, THE NEEDED QUALIFICATIONS, AND SOME INDICATION OF THE NECESSARY WORKER TRAIT REQUIREMENTS SUCH AS APTITUDES, INTERESTS, TEMPERAMENT, AND PHYSICAL DEMANDS AND WORKING CONDITIONS ARE DESCRIBED. THE BIBLIOGRAPHY CONTAINS 29 REFERENCES. THIS DOCUMENT IS ALSO AVAILABLE FROM THE SUPERINTENDENT OF DOCUMENTS, U.S. GOVERNMENT PRINTING OFFICE, WASHINGTON, D.C. 20402. (CG)