The United States Employment Service (USES), in cooperation with State employment services, has conducted a continuing program of occupational test research and development since the mid-1930's. This program has produced a variety of tests and assessment techniques useful in vocational counseling and in selection of individuals for specific jobs. The tests have wide applicability and are used by local offices of State employment services, schools, employment and training organizations, and many foreign countries. The purpose of this series of reports is to provide results of significant test research projects. The following tests and techniques described in detail, have been developed for measurement of occupational aptitude, clerical skills, literacy skills, and occupational interest: (1) General Aptitude Test Battery; (2) Nonreading Aptitude Test Battery; (3) Specific Aptitude Test Batteries; (4) Clerical Skills Tests; (5) Basic Occupational Literacy Test; (6) Pretesting Orientation Techniques; (7) Interest Check List; and (8) USES Interest Inventory. (Author/PN)