Book excerpt: An introduction to the United Nations which illustrates the organization "in action" through a selection of case studies organized into six parts. The first part describes the institutional shape of the UN, including its purpose, principles, and structure. Subsequent sections provide case studies divided by type of activity, including peacekeeping and collective security; nuclear questions; human rights; new nations; and new initiatives in the face of global changes. Each chapter provides a brief guide to complex facts and legislation. Annotation copyright by Book News, Inc., Portland, OR