This manual is intended to guide evaluators, special needs personnel, private practitioners, manpower training instructors, and others in selecting, using, and modifying psychological tests within an evaluation or assessment setting. The first section discusses reasons for using tests in vocational evaluation, problems in using the tests, testing conditions and practices, and procedures for selecting and using tests. Addressed in a section on test modification are some general cautions to those modifying tests and specific methods for modifying tests for blind, deaf, and mentally retarded persons. The third part of the guide consists of test review outlines of 4 achievement, 18 aptitude, 5 intelligence, 9 interest, 12 work attitude and behavior, and 6 dexterity tests. Each outline includes information on the test's purpose, subtests, characteristics, usefulness in its present form, and possible modifications, as well as criteria for selecting the test, subjective comments, and a source from which the test may be ordered. (MN)