This manual is a guide to the Work Temperament Inventory (WTI), a self-report measure of 12 work temperaments that were originally identified and defined by the U.S. Department of Labor. The WTI consists of 134 items requiring a simple "like" or "dislike" response and a reading level of seventh grade. It can be completed in 15 to 20 minutes using a consumable booklet or direct input to the WTI Computer Report. The validity of the WTI is supported by the original developmental analysis, the factor analytic structure of the 12 temperaments, convergent and divergent relationships with measured occupational interests, and the differential temperamental requirements of 91 worker trait groups. The WTI Computer Report generates a normative profile on the 12 work temperament scales and then lists up to 12 worker trait groups for which the respondent is temperamentally suited. Extensive appendices include instructions for using the WTI Report, a description of the WTI computer program, worker trait group codes, sample descriptions of worker trait groups, critical temperaments for worker trait groups, WTI scale descriptions with examples, the WTI scoring key, WTI norm translations, demographic characteristics of the normative sample, and interest inventory scales. The WTI itself is attached. (Contains 11 references.) (DB)