Using a variety of clear and easily viewed charts and maps the author describes the medically uninsured population and examines the characteristics of three specific groups of those workers with no group-health insurance from their employers, those who have group-health insurance from a source other than their employers, and the self-employed. How many of these people would be affected by legislation which would either require or encourage employers to provide group-health insurance as a part of the wage-compensation package? This chartbook is necessary reading for all those interested in the implications of legislative proposals to cover the uninsured currently being debated.