The unit provides an introduction to employment service testing for supervisors, interviewers, and employer relations personnel who need a basic knowledge of testing but who do not need to be test technicians. It may also be used as an introductory course for test examiners and counselors. The first part of the guide is an orientation to occupational tests. Part two concerns the nature and purpose of the U. S. Employment Service (USES) Aptitude Tests, particularly the General Aptitude Test Battery and the Nonreading Aptitude Test Battery. Continuing development of USES Aptitude tests is discussed in part three. Part four is devoted to particular clerical skills tests: typing, dictation, spelling, statistical typing, and medical and legal spelling. The purpose and appropriateness of testing, analyzing test results, and the circumstances for the release of tests are considered in part five. A brief review constitutes the concluding section. (AG)