The Micro-TOWER System of Vocational Evaluation was developed in response to the need for a revision of the TOWER (Testing, Orientation, and Work Evaluation in Rehabilitation) System. The Micro-TOWER system of work sample tests measures the major aptitudes required for most semi-skilled and unskilled occupations. It may be used as a screening device, preceding more extensive evaluation. A variety of general vocational aptitudes are measured--verbal, numerical, motor, spatial, and clerical perception skills. These skills were originally chosen to parallel the Dictionary of Occupational Titles aptitudes, and include message taking, making change, bottle capping and packing, lamp assembly, blueprint reading, and mail sorting. The system has been field tested on a variety of populations, and is suitable for the physically handicapped, emotionally disturbed, and Spanish-speaking. Separate norms are available for a number of different groups. The test is administered, using a tape recorder, to a group of approximately five to ten clients at one time. At the beginning of each work sample, occupational information is presented. Procedures for test administration, test use, interpretation of results, and related technical studies are described. (GDC)