This third, supplemental volume continues the approach of the original two volumes of the Encyclopedia of Catholic Social Thought, Social Science, and Social Policy that were published in 2007. First, the volume includes entries that explore Catholic social thought at its broadest, most theoretical level. Second, the volume includes entries that discuss recent social science research that bears on issues important to Catholic social thought. Third, the volume includes entries discussing specific issues of social policy that have become increasingly important in recent years.