The Harvard Studies in Career Development (1949-1971) are reviewed in this volume to provide students and professionals with a comprehensive survey and analysis of these studies and to provide a primary source document for theory and research in the field of career development. The volume is organized in four major sections, preceded by an overview chapter on occupational behavior and the psychology of career development. Section 1 documents the theoretical context generated by the Harvard Studies, focusing on decisionmaking processes, self-concept, and theory of purposeful behavior. Section 2 is devoted to a critical review and elaboration of the theoretical context presented in Section 1. Section 3 discusses new directions in theory and research, including imagination and ego synthesis, research strategies, the organization and intention of a proposed data and educational system for vocational decisionmaking. Section 4 addresses implications for education, guidance, and counseling psychology. Appendixes contain name and subject indexes, a bibliography, and information under the following headings: The Operational Specification of Ideal Purposeful Action, Detailed Scoring of Malfunctions in Purposeful Action in Relation to Justification of Vocational Choice, Understanding Needed for Prevention of Claim that System Determines Lives, Preliminary Specifications for Data and Routines, and Procedures for Implementing the Making of Vocational Decisions. (TA)