Trustworthy information about career assessment instruments and their value for career counseling is difficult to obtain. This text contains information and reviews of a wide range of assessment instruments. The decisions as to what instruments to include for review were based on input from an advisory committee, a review of the literature and of publisher catalogues, and the results of a survey of users. The principles underlying the decisions to select instruments for review included selecting previously reviewed instrument that have undergone extensive revisions or update, new instruments that appear to have promise of extensive use, instruments that could be used by employers to make hiring or advancement decisions, and instruments with proven utility for persons with disabilities of disadvantages. Fifty-two instruments in forty-nine test reviews comprise the heart of this volume. These are divided into six categories: Comprehensive Aptitude/Achievement and Companion Measures; Interest; Values and Satisfaction; Career Development/Maturity; Personality; and Instruments for Disabled and Disadvantaged Populations. Reviews begin with publisher-provided information, followed by a brief critical review of the instrument's strengths and limitations. Also provided is practical information which potential users can refer to in order to gauge the usefulness of an instrument. (RJM)