The purpose of this revised publication is to provide secondary teachers with practical suggestions on teaching about the United Nations system in conjunction with contemporary world problems and issues. Part One describes the foundation of the United Nations and discusses its purposes, members, and structure. Chapters three through 14, which comprise Part Two of the publication, treat the following topics: peace and security; disarmament; human rights; population; poverty and economic progress; the environment; the sea and sea-bed; social justice for workers; food and hunger; health; children's welfare; and education, science, and culture. Background information and questions for study and discussion are provided on each topic. A description of the functions of intergovernmental agencies related to the United Nations is provided on each topic. (Author/RM)