The papers in this volume were fIrst presented at a symposium on "An Expanded Public Role in Job Training? The Issue of Market Failure in the Provision of Training. " The symposium took place in May, 1989. It was sponsored by the LaFollette Institute of Public Affairs at the University of Wisconsin, Madison. JozefRitzen, then in Madison on leave from Erasmus University in the Netherlands, organized the symposium. Subsequently he became Minister of Education and Science for the Netherlands. He asked David Stern to fInish the work of editing the papers for publication. All the papers have been revised in light of comments by discussants at the symposium, as well as subsequent comments by the editors and outside reviewers. INTRODucrroN AND OVERVIEW Jozef M. M. Ritzen Erasmus University Rotterdam Minister of Education and Science The Netherlands David Stem School of Education University of California, Berkeley Two factors are contributing to an increased interest in the training of adult employees. First, there is the present high rate of change in the technologies embodied in products and in production processes. This enhances the negative effect of the undersupply of training on economic growth. Higher levels of training would provide a more fertile environment for technological change. The second factor is the aging of the population.