This technical supplement to the Armed Services Vocational Aptitude Battery (ASVAB) Counselor's Manual presents the current research that has accumulated on the ASVAB. Information in this supplement was collected from published and unpublished sources, both civilian and military. This supplement contains both actual results of data analyses and summaries of relevant studies. It is designed to be used with the ASVAB Counselor's Manual for ASVAB-14. It can be used by counselors, administrators, and teachers; however, because much of the material in this supplement is technical in nature, it is intended primarily for educational researchers, psychologists, statisticians, and psychometricians. The document is divided into these sections: (1) background on the ASVAB, including the current Department of Defense student testing program and ASVAB content; (2) development of ASVAB-14, including subtests, factor analysis, and composites; (3) descriptive statistics and norms, focusing on comparisons of subgroups within the 1980 population; item analysis for weighted sex and grade normative groups; means, standard deviations, and intercorrelations; grade and sex differences; norms; and sampling effects; (4) reliability; and (5) validity, divided into subsections on relationship of the ASVAB-14 to other tests and predictive validity of the ASVAB-14. A bibliography and an annotated bibliography are included. The appendix includes item taxonomies and norms. (ABL)