A review of followup study research is reported which focused on issues and trends in the evaluation of vocational education programs and their implications for human resource development. The analysis of representative studies selected from a survey of the literature is divided into four sections, one for each of four types of studies: (1) Administrative reports, (2) comparative studies, (3) cost-benefit analysis studies, and (4) studies relating to the development of technology, instrumentation, data systems, methodology, and guides and manuals. A brief summary is presented on the usefulness of each type of study, and general comments are added regarding future trends for followup research and criteria used to evaluate vocational programs. The overall conclusion stated is that followup studies continue to suffer from some severe problems, some of which are procedural and others conceptual. These problems are listed, and recommendations are made regarding (1) the need for increased research activities on relationships between vocational education and economic cycles and (2) the need to encourage and sponsor research efforts on a higher scale at the State, regional, and national levels. A bibliography lists 37 studies. (JT)