This document provides a description of the Model United Nations (MUN) program, its educational benefits, an overview of its practice within the United States, and outlines methods for using the MUN as a teaching tool. A total of 72 MUNs involving high school and college students was reported in 1977-78. As a simulation, the MUN provides replication of real life social processes and involves activities of decision making, allocation of resources, planning, and negotiation. Students role play delegates from member states of the United Nations. Benefits to students include heightened interest and motivation, an opportunity to apply and test knowledge gained from reading, a greater understanding of problems faced by decision makers, and an understanding of real world phenomena through a more simple microcosm. Three stages comprise MUN activities: preparation, deliberation, and decision. The first stage consists of research and involves developing country profiles, analyzing problems, writing position papers, formulating resolutions, planning, and strategy. The second stage, deliberation, involves agenda setting, formulating alternatives to proposals, and legitimation, or winning support for resolutions. The third stage, decision, calls for either tabling the resolution or voting on it. Tables which rate student delegate responses to prerequisites for peace are included. (KC)