This document contains the three volumes of the technical report for development of the prototype of the Occupational Information Network (O*NET), which is intended to replace the "Dictionary of Occupational Titles.""General Introduction" (Norman G. Peterson) presents an overview of O*NET's purpose, content, and structure. "Research Method: Development and Field Testing of the Content Model" (Norman G. Peterson, Michael D. Mumford, Kerry Y. Levin, Jim Green, Joseph Waksberg) details the methodology used to assess the meaningfulness and usefulness of the O*NET system. The remaining four papers in volume 1 describe the results of the analysis of the data for the following O*NET domains: skills, knowledges, occupational preparation, and generalized work activities. The papers are as follows: "Basic and Cross-Functional Skills: Evidence for the Reliability and Validity of the Measures" (Michael D. Mumford, Norman G. Peterson, Ruth A. Childs); "Knowledges: Evidence for the Reliability and Validity of the Measures" (David P. Costanza, Edwin A. Fleishman, Joanne C. Marshall-Miles); "Education, Training, Experience, and Licensure/Certification: Evidence for the Reliability and Validity of Measures" (Lance E. Anderson); and "Generalized Work Activities: Evidence for the Reliability and Validity of Measures" (Walter C. Borman, P. Richard Jeanneret, U. Christean Kubisiak, Mary Ann Hanson). Five papers contain substantial bibliographies. The five papers in volume 2 describe the results of the analysis of the data for the following O*NET domains: work context, organizational context, abilities, occupational values, and work styles. The papers are as follows: "Work Context: Evidence for the Reliability and Validity of the Measures" (Mark H. Strong, P. Richard Jeanneret, S. Morton McPhail, Barry R. Blakely); "Organizational Context: Evidence for the Reliability and Validity of the Measures" (Sharon Arad, Mary Ann Hanson, Robert J. Schneider); "Abilities: Evidence for the Reliability and Validity of the Measures" (Edwin A. Fleishman, David P. Costanza, Joanne C. Marshall-Miles); "Occupational Interests and Values: Evidence for the Reliability and Validity of the Occupational Interest Codes and the Values Measures" (Christopher E. Sager), and "Work Style Descriptors: Evidence for the Reliability and Validity of Measures" (Walter C. Borman, U. Christean Kubisiak). Four papers contain substantial bibiographies. Papers in volume 3 cover topics that cut across the O*NET domains, including possible covariates of O*NET rating data, cross-domain analyses, cluster analyses of occupations, use of O*NET data to describe occupations, and analyses and methods of collecting occupation-specific information. The papers are as follows: "Occupational Descriptor Covariates: Possible Sources of Variance in O*NET Ratings" (Ruth A. Childs, Norman G. Peterson, Michael D. Mumford); "Cross-Domain Analysis Results" (Mary Ann Hanson, Walter C. Borman, U. Christean Kubisiak, Christopher E. Sager); "Occupational Classification: Using Basic and Cross-Functional Skills and Generalized Work Activities to Create Job Families" (Dwayne G. Norris, Wayne A. Baughman, Ashley E. Cooke, Norman G. Peterson, Michael D. Mumford); "Issues in O*NET Applications" (Walter C. Borman, Mary Ann Hanson, U. Christean Kubisiak); and "Occupation-Specific Descriptors: Approaches, Procedures, and Findings" (Michael D. Mumford, Christopher E. Sager, Wayne A. Baughman, Ruth A. Childs); and "Conclusions and Recommendations" (Norman G. Peterson). The computer-assisted telephone interview protocol for organizational representatives and other data collection materials are appended. One paper contains a substantial bibliography. (MN)