This study was conducted to identify and review research studies related to career guidance effects, to categorize and synthesize those findings, and to make recommendations for future practice, research, and policy. Studies selected for the review were conducted since 1970, concerned grades 9 through 14, had a sample population of 25 or more, were set in an educational agency or community service organization, and were empirical. These studies were identified through telephone contacts with career guidance experts, a computer search of the literature, letters to state departments of education, convention programs, journals, congressional hearings, and other sources. Review of the studies showed that they could be organized into five major categories according to career guidance outcomes: (1) improved school involvement and performance (41 studies); (2) personal and interpersonal working skills (30 studies); (3) preparation for careers (14 studies); (4) career planning skills (34 studies); and (5) career awareness and exploration (44 studies). The majority of the studies reported positive outcomes as a result of various methods of career guidance intervention. As a result of the study, numerous recommendations were made regarding state and federal policy, practices, and research in the field of career guidance. (KC)