This document discusses some dimensions of post-school training in the United States--who gets trained, what are the types of training, who provides it, and how training affects subsequent labor market outcomes. An introduction discusses reasons for the research questions and the reliability of existing reported measures of training. An overview describes the most important data sources which contain self-reported training measures and the limitations of this information. The overview also contains a broad description of who gets trained, by whom, the types of training provided, and estimates of how much training is provided. The determinants of training are taken up in the next section. The determinants investigated include educational attainment, industrial rates of technical change, labor market experience, race, union membership, and labor market conditions. The final section addresses the effects of training on earnings, earnings growth, and employment stability. The document includes a 30-item bibliography and an appendix with five tables. Twenty other tables appear in the text. (CML)